Equipment (Small)

• Comfortable clean lightweight easy cleaning mode.
  With national patent design More scientific More efficient
• Supragingival & subgingival mode Two-in-one.
  Amazing dental air polisher with subgingival mode.
• 0.7mm small-caliber nozzle More concentrated powder output More accurate scaling 
• 1.4mm Nozzle caliber for water measures 
  1.4mm Smaller caliber allows for more concentrated.
• Three-section air-polishing handpiece design
• Detachable handpiece.
  Woodpecker handpiece can be detached for maintenance if a clog occurs, which makes it unique among all the brands.
• 360 rotatable Pre-bendable subgingival nozzle
  Three-direction powder output One-direction water output Efficiently eliminate biofilms
  Thoroughly clear dead ends.
• User-friendly design
  A lateral transparent powder container enables easier observation of the remaining powder.
• Ergonomic design More flexible and lightweight
  Easy quick connection for plugging and using The lightweight design relieves grip fatigue.
  Suitable for all dental chairs The whole device weights about 125g, much lower than similar products on the market (135-165g) Easy to adjust the angle, flexible to apply to use.
  

• Fast: 300g/bottle (PT-S1 sodium bicarbonate)
• 65um sodium bicarbonate supragingival powder, Used for rapid removal of stubborn pigment, soft dirt and biofilm on the adult gingival
• 2.5 Mohs' hardness, Provides efficient and rapid removal of stubborn pigment, soft dirt and biofilm on adult gingival

• Gentle Mini: 120g/bottle (PT-S3 glycine)
• 25um glycine is gentle and non-invasive to the soft tissue in the periodontal pocket, and to the gingival, upper jaw as well as dental tissue surface, can be used for maintenance of pediatric teeth, women's teeth, orthodontics, restorations, periodontal and implants.
• With hardness less than dentin, Can be safely used in subgingival scaling, periodontal and implant cleaning and maintenance

• Small but Powerful Making a Big Difference
  Full-metal body, ergonomically-streamlined and 108g lightweight design, without fatigue from extended usage periods. Anti-shock and durable.
• 7 Modes to Fully Meet a Variety of Clinical Needs
  It has Normal, high, turbo, ortho, soft, pulse, and check modes. Like an all star, O-Star is strong in performance, well-controlled and can fully meet various clinical needs.
• Light Intensity up to 3000MW/cm²
  The high light intensity brings sufficient curing depth, which can reduce the curing time and greatly improve the efficiency of resin curing.Equipped with 10w LED, bringing you full confidence in curing.
• 360° Rotatable Head Meets Various Clinical Needs
  360° Rotatable head, easy to illuminate all angles in the mouth. The low-profile head can easily reach the posterior teeth. The patient only needs to open the mouth slightly and enjoy comfortable treatment.
• Less Light Loss
  The light intensity of curing lights decreases when the distance of the curing light increases. Compared to other curing lights (VALO Cordless / Bluephase PowerCure) the O-Star undergoes less light loss.
• Uniform Beam, Strong Penetrability
  More-focused light output thanks to the light angle of only 15.8º, ensuring good deep curing effect.
• Charging Base with Built-in Light Meter
  There is a light meter built in to the charging base. Accurate light intensity is required for efficient polymerisation of the resin, bringing you and your patients the best treatment experience.
• Simple Two-button Design Enables Easy Operation
  Equipped with OLED screen, the mode, light intensity and time can be clearly displayed to avoid clinical errors.

• Working mode setting
  Short press the “M/T” button to select the working mode. Seven working modes can be selected: Normal, High, Turbo, Ortho, Soft, Pulse and Check. Because the curing time of different modes is different, when switching modes, the curing time will automatically follow the switching.
  
• Curing time setting
  Long press the “M/T” button to change the curing time. Different working modes have different curing times.

• One year warranty
• Tips: In order to protect the device, pls remember to wear a disposable isolation sleeve before using.

• FDA Approved.
• 5W high power blue light LED.
• Cure 2mm reins in one second, go quicker than ever.
• 360 degree plastic rotary head, extend the possibility.
• Constant power output, born for dental restoration.
• Two working modes for option, with the maximum light intensity of 2500mw/cm2.
• Especially suitable for orthodontic brackets, porcelain verneers and post-core adhensives.
• Woodpeckerrechargeable lithium battery had received CB certification. The batteries refuse explosion.
• Warranty:One year's free repair for the whole unit from the date of purchase. 

• TURBO Mode: screen shows P1, Press the time button to select of time which could be 1 and 3 seconds. Its output light intensity is about 2300mW/cm2-2500mW/cm2.
• NORMAL Mode: screen shows P2, Press the time button to select of time which could be 5, 10, 15 and 20 seconds. Its output light intensity is about 1000mW/cm2-1200 mW/cm2.
  

The technical specification :

• Automatic Frequency Tracking 
• Patented Liquid Pumps, Digital Controlled 
• Function: Scaling, Perio, Endo
• Control: Wireless foot switch
• Water Supply: Auto-water supply
• Handpiece: LED handpiece

Primary vibration excursion of the tip:

• Minimum, 1um, Deviation -50%
  • Maximum. 100um, Deviation +50%

Output half-excursion:

• Minimum, O.1N, Deviation -50%
• Maximum. 2N, Deviation +50%

Warm tips:

• If the machine does not produce water, you can adjust the water knob to the maximum, step on the pedal, use the syringe attached in the package, from the water outlet, fill the water to the machine, generally need 1-2 syringe of water can flush the waterway, and then can be used normally. If you need, you can contact us first and we will send you an operation video.

• Advanced Multi-Frequency Technology: The C-ROOT I employs cutting-edge electronic measurement technology to precisely locate the apical constriction, even in challenging conditions involving blood or residual pulp. This apex locator is engineered for consistent performance across diverse tooth types and root canal anatomies, ensuring reliability in complex cases.
• Real-Time Display: The 3.5-inch color display boasts a high-definition resolution of 480 x 320, ensuring clear and detailed visuals. This facilitates immediate and intuitive navigation through settings, as well as precise representation of the file's position within the root canal. As a result, it significantly enhances monitoring and control during procedures.
• User-Friendly Interface: The intuitive touchscreen allows for simple adjustments of various parameters, including luminance, alarm sounds, and apex position, making it accessible for both experienced practitioners and those new to endodontic procedures.
• Compact and Lightweight Design: With a thickness of only 2 cm when folded, the C-ROOT I is incredibly portable and easy to handle without compromising on accuracy.
• Rechargeable Lithium Battery: The locator is powered by a rechargeable battery, providing the convenience of wireless operation and eliminating the constraints of power cords during procedures. Charging time is a quick 3 hours.
• High Accuracy: Achieves precise measurements with an accuracy of ±0.5 mm, making it a reliable tool for endodontic treatments. 
• Durable Construction: Built to last, the C-ROOT I has a service life of up to 10 years and is backed by a one-year warranty, ensuring long-term investment value.
• Safety Features: The C-ROOT I is designed with built-in safeguards to prevent over-insertion and ensure patient safety during root canal therapy.

• FDA Approved.
• With auto-water supply function, easier operation.
• Controlled by PC, easy operation and more efficient for scaling.
• Less heat from tip during operation. Improve comfort degree of patients.  
• Optical handpiece, more convenient for clinical operation.
• Detachable handpiece HW-5L with light, better visibility and can be autoclaved to the temperature of 134°C and the pressure of 0.22MPa.
• Automatic frequency tracking ensures that the machine always works on the best frequency and performs more steadily.
• The new product UDS-E LED ultrasonic scaler used for teeth cleaning and also an indispensable equipment for teeth disease prevention and treatment.
• The device has scaling, perio, endo and auto-water supply functions with the following features. These features make UDS-E LED become a new generation product in the world dental market.
• The inner water pipe is made from antiseptic material, clinical fluids, such as hydrogen peroxide, chlorhexidine and sodium hypochlorite, etc, can be used perfectly under the mode of auto-water supply system so that the performance of perio and endo is improved dramatically.

One year's free repair for the whole unit from the date of purchase. Lifetime maintenance.

• Using high quality LED lights to increase the brightness with no ghosting and clear imaging.
• Work with comfortable breezes , effectively prevent mirror fogging up when human breath.
• Be more convenient to play a role in anti-fogging.
• There are four type stainless steel reflectors for meeting virous shooting needs: shooting for teeth face and maxillofacial.
• Built-in high-end current-limiting chip, automatic input current regulation, safety protection.
• The handshake position is equipped with a smooth design pad to make your touch more comfortable.
• Intelligent double switch control.

• Dental LED Curing Light Noiseless Fiber Rod Recharge 2000mw/cm²
• 5W high power
• Excellent quality with competitive price
• Quick delivery and good service
• Service tools for dental and easy to maintain and recharge conveniently
• Large capacity Li-battery can be used for a long one with full charging.
• Plenty of fiber rods with very reasonable price on sale for you replacement
• Composes of high power LED, qualified fiber rod.
• Noiseless; No liberation; Generate little heat when working.
• Imported high power LED and four chips inside.
  
• Gradually bright, shiny,bright-wide, the work of three models to choose.
• Reliable structure and easy operation.

• 100% Original Woodpecker ultrasonic scaler tips sets.
• Use the torque wrench to screw the tip.
• Diamond-coated, for retreatments of extremely hard materials.
• Connected to the ultrasonic scaler to remove the subgingival calculus and used for subgingival tartar elimination. Use the torque wrench to screw the tip.
• Autoclavable under the high temperature of 134℃ and pressure of 0.22Mpa.
• Compatible with Woodpecker DTE SATELEC handpiece.
• One year quality guaranty.

• Color: Silver
• Material: High Quality Stainless Steel
• Weight: 2.5OZ
• Package: 5Pcs/Set (Choose Qty)

• Scope: For scaling, endo and cavity preparation.

• PD1 Tips fit WOODPECKER DTE series Ultrasonic Scalers (D1/ D7 LED/ D7/ S6/ D5 etc.).

• This high power 2000mw/c㎡ LED Curing Light has a humanity intelligent chip with a high intensity
• LED light and Li-on rechargeable battery.
• This device can cure all the dental resin known in the market nowadays; with a performance level far
• Superior than the halogen curing light's, it has 3 different working modes and it can solidify 4-5 mm
• Deepness in a few seconds.
• Please note that there is an isolation film at the bottom of the electromagnetic field, which needs to be removed before first use.

• Very convenient to operate.
• Small size,cordless and light weighted.
• No dazzling strong light which allows you to aim the light to the exact position and improve the effectiveness of the treatment.
• No vibration, noiseless operation.
• High power rechargeable battery.
• High powerful light intensity with a maximum reach of 2000MW/cm2.
• 3 different working time modes, exposure time for optional curing: 8s/6s/4s.
• Light guide can rotate through 360°
• You can select the correct mode according to the different types of material you wish to cure,their speed of reaction,and the clinical protocol you are following.

• Mono-fiber glass light guides for various applications.
• Anodized aluminum hand-piece.
• Latest generation of CMS electronics.
• Very high-quality single L.E.D.
• Lithium ion battery with no memory effect

• Silent and hygienic, no fan.
• Round surfaces allow for easy and comfortable manipulation.
• Compact, lightweight and well-balanced light guide rotates through 360°.
• Base-charger can be turned in all directions and low battery warning.
• Can be used anywhere in the world. The voltage input is 110 V-240 V and we will provide you with the correct adapter according to the shipping destination.

1* LED Curing Light Device

1* High Capacity Rechargeable Battery

1* Charger

1* Charger Socket

• FDA and CE0197 Certificated.
• Digitally controlled, easy operation and more efficient for scaling.
• The device is used for the dental calculus elimination and root canal treatment.
• Optical handpiece, more convenient for clinical operation. The handpiece is detachable and can be autoclaved to the high temperature of 135℃ and the pressure of 0.22MPa.
• Automatic frequency tracking ensures that the machine always works on the best frequency and performs more steadily.

One year's free repair for the whole unit from the date of purchase. Lifetime maintenance.

• Well Surface Finished
• 135℃ Autoclavable
• Used to tighten the scaling tips
• Cannot hold the tips
• Fit the scaler brand of Woodpecker DTE SATELEC NSK EMS and many brands scaler handpiece

• LED Screen, high quality plastic handle.
• Noiseless and no vibration when working
• Lithium battery with large capacity
• Three Modes: Gradually mode/Flashing mode/All light mode
• Automatically power down: It will be turned automatically off automatically without pressing button for 3 minutes.
• Solidification time is :40 s. Every ten seconds, sound signal to remind operator. The length of work time can be controlled freely. 
• It has self-protection against exceeding heat after continuous long time work that power– off  by itself. After the temperature is normal, operator can use it again.
• The LED is longevity. Cold light source, no fan. Avoid the infection, cause of air movement. 

• 10W high power blue light LED.
• Checking method：the LED light is fine when the light is on during operating correctly.
• The wave length of this product can match with the clinical dental resin solidification, such as 3M, Dentsply etc.
• Wave length：385nm-515nm.
• Light intensity：1000mW/cm²-3100mW/cm².
• Note:  Do not sterilize the detachable head in autoclave. Please make sure to cover the unit with a disposable isolation sleeve before each use. 

• Press the mode button.Following Seven modes are available:
• M1: Standard mode:Screen shows M1,Press the button to select of time which could be 5s,10s,15s,20s.Its output light intensity is about 1000mW/cm²-1300mW/cm².
• M2: Strong light mode:Screen shows M2,Press the button to select of time which could be 3s,4s,5s.Its output light intensity is about 1800mW/cm²-2100mW/cm².
• M3: Super-strong light mode:Screen shows M3,Press the button to select of time which could be 1s,2s,3s.Its output light intensity is about 2700mW/cm²-3100mW/cm².
• M4: Orthodontic mode:Screen shows M4,Press the button to select of time which could be 3s /5 times, 3s /10 times.Its output light intensity is about 2700mW/cm²- 3100mW/cm².
• M5: Examination mode: Screen shows M5,Press the button to select of time which could be 30s times, 60s times.Its output light intensity is about 2700mW / cm² - 3100mW /cm².
• M6: Pulse mode:Screen shows M6,Press the button to select of time which could be 5s,10s,15s,20s.Its output light intensity is about 1000mW/cm²-1300mW/cm².
• M7: Progressive mode:Screen shows M7,Press the button to select of time which could be 5s,10s,15s,20s.Its output light intensity is about 1000mW/cm²-1300mW/cm².

• 100% woodpecker brand original.
  
• Can hold the tips
  
• Used to remove the scalar tips or screw the scaler tips
  
• 135 degree autoclavable
  
• Fit Woodpecker EMS brand scalers

• Product Name: Torque wrench
• Brand: Woodpecker
  
• Model: TW-1L
  
• Package: 1 PC
• Fit for: Woodpecker EMS brand scalers

• Expert in comfortable scaling.
• Digital control, easy operation and more efficient for scaling.
• Comes with 7 Tips: GD5x1, GD12x1, PD4x1, PD7x1, PD12x1, ED60x2.
• Three functions: scaling, perio and endo functions. Integrate supragingival scaling, subgingival scaling and endodontic treatment into a whole.
• Smart touching system, clear control panel display, ultrasensitive touch control makes it easier to operate.
• The detachable handpiece can be autoclaved to high temperature 134°C and high pressure 0.22Mpa.
• Automatic frequency tracking ensures that the machine always works on the best frequency and more steadily.
• Intelligent degenerative system enhances professional operation.
• Sine-wave drive. Avoid stimulation caused by instantaneous current output. Bring patients with comfortable treatment.

• 100% new with good quality.
• Quick connector for water hose of ultrasonic scalers.
• It is a healthy and environmental material with poison-free performance.
• Medical instrument for professional use.

• FDA Approved.
• Digitally controlled, easy operation and more efficient for scaling.
• The device is used for the dental calculus elimination and root canal treatment.
• Optical handpiece, more convenient for clinical operation. The handpiece is detachable and can be autoclaved to the high temperature of 135℃ and the pressure of 0.22MPa.
• Automatic frequency tracking ensures that the machine always works on the best frequency and performs more steadily.
• Warranty: One year's free repair for the whole unit from the date of purchase. Lifetime maintenance.

• Compatible with EMS, SATELEC, Woodpecker, DTE
  
• The product can effectively prevent the scaler tips from hurting the hand.
• The removed tip would be clamped by the wrench to prevent the scaler tips from falling.
• Can hold the scaler tips, prevent touching the tips with hands and avoid cross infection.
• Autoclavable under the high temperature f 135℃ and pressure of 0.22Mpa, avoiding Cross Infection effectively.
• The torque is preset. Once the strength exerted to the scaler tip reaches the limit, the clutch inside the wrench would skid, could not exert any further strength to the tip, thus effectively protecting the ultrasonic scaler hand piece
• Package Including: 1Pc Wrench

• Compatible with Woodpecker, VRN Scaler.
  
• Upgraded medical grade stainless steel metal cover, disinfection does not crack.
• With LED lights, the light is more uniform.
  
• Body with anti-skid groove, more comfortable to hold.
• 135℃ High Temperature Sterilization

• Alumina sandblasting gun
• Alumina sandblast guns have proven to be the most valuable tools in the dental field thanks to their effective, powerful effects and extensive application methods.
• Alumina sandblasting guns provide precise surface micro-grain treatment that can increase adhesion up to 400%.
• The surface that has just been etched is more active, so it can increase the chemical adhesion and optimize the bonding effect.
• It can be applied to all metal materials, composite materials and ceramic materials.

• Product use for : to increase the viscosity of the tactile surface, roughening.
• High-temperature and high-strength engineering material sand tanks to ensure a firm grip structure.
• High sensitive touch switch, start and stop by the heart.
• Convenience and gas connection.
• The surface of the metal composite material, tungsten Steel, fiber post, inlay surface.
• With water.

• Extraoral application, used for:
• Fiber post;
• Inlay/onlay;
• Maryland Bridge;
• Metal/Porcelain crown;
• Orthodontic brackets and holder;
• Defect detection of metal casting restorations;
• Inspection of metal crown restoration defects detection;
• Check the precise installation and occlusion of the metal crown.
• Surface cleaning and micro roughening treatment before bonding;
• Remove the original adhesive layer cement before the second bonding;

• Aluminum Oxide, 90 micron, tan Rapid removal of cements from metals.Preparation of metals for bonding. 
• Aluminum Oxide, 50 micron, white General bonding preparation of metallic and nonmetallic surfaces.(Will not discolor porcelain or composites). 
• Microprophy B, white Stain removal.Pit and fissure preparation.Sodium Bicarbonate,Flavored. 
• SA-85 Remove resin paste without enamel erosion.
• Glass Beads, 90 micron, white Satin luster texturing metal surfaces to reduce brightness. Clean dentures. Not for bonding or intraoral use.

• Alumina sandblasting gun
• Alumina sandblast guns have proven to be the most valuable tools in the dental field thanks to their effective, powerful effects and extensive application methods.
• Alumina sandblasting guns provide precise surface micro-grain treatment that can increase adhesion up to 400%.
• The surface that has just been etched is more active, so it can increase the chemical adhesion and optimize the bonding effect.
• It can be applied to all metal materials, composite materials and ceramic materials.
• After use, do not put sand powder in the product, just flush it with air and water.
• The Dental Alumina Air Abrasion Polisher is not suitable for autoclaving. If you want to disinfect, it is recommended to wipe with alcohol.

• Product use for : to increase the viscosity of the tactile surface, roughening
• High-temperature and high-strength engineering material sand tanks to ensure a firm grip structure.
• High sensitive touch switch, start and stop by the heart.
• Convenience and gas connection.
• The surface of the metal composite material, tungsten Steel, fiber post, inlay surface.

• Aluminum Oxide, 90 micron, tan Rapid removal of cements from metals.Preparation of metals for bonding. 
• Aluminum Oxide, 50 micron, white General bonding preparation of metallic and nonmetallic surfaces.(Will not discolor porcelain or composites). 
• Microprophy B, white Stain removal.Pit and fissure preparation.Sodium Bicarbonate,Flavored. 
• SA-85 Remove resin paste without enamel erosion.
• Glass Beads, 90 micron, white Satin luster texturing metal surfaces to reduce brightness. Clean dentures. Not for bonding or intraoral use.

• For Aluminum oxide air abrasion.
• This SandTrap is effective in preventing sand powder from flying around.
• This SandTrap can withstand high-pressure steam disinfection at temperatures up to 134 ℃, helping to prevent cross-infection.
• Package: 2pcs/Set.

• FDA & CE certificated.
• 100% Original Woodpecker detachable SATELEC handpiece.
• Autoclavable under the high temperature of 135℃ and pressure of 0.22Mpa.
• Compatable with Woodpecker DTE Scalers (DTE D5 D7 LED etc.).
• Brand new and get from the factory directly.
• One year quality guaranty.

• FDA Approved.
• Small and light, easy operation.
• Three functions: Scaling, Perio, Endo.
• SATELEC's handpiece and tips are compatible.
• The handpiece is cast from Titanium alloy to ensure sound mechanic function and durability.
• Assembled with excellent piezo-ceramic, the handpiece has high and long lasting power and generates little heat.
• Detachable handpiece, autoclavable under the high temperature of 135°C and the pressure of 0.22 MPa, avoiding cross infection effectively. Skid proof hand piece. The nipple can be cleaned. The material of the handpiece made in America is appointed as aero plastic components in Europe and America, which is FDA and NSF certificated.
• The cable is made from silica gel tube, soft and durable.
• The scaler tips is made of special material. The cavitation produced form the end of the scaling tip makes the cleaning of teeth and the killing of germ easily, nice and durable. 
• Digitally controlled, automatic frequency tracking ensures that the machine always works on the best frequency and more steadily.
• Eliminating the dental calculus, bacterial plaque and tea scales on the teeth quickly without hurting the gum or the enamel.
• Warranty: One year's free repair for the whole unit from the date of purchase. Lifetime maintenance.  

• FDA Approved.
• Small and light, easy operation.
• Three functions: Scaling, Perio, Endo.
• SATELEC's handpiece and tips are compatible.
• The handpiece is cast from Titanium alloy to ensure sound mechanic function and durability.
• Assembled with excellent piezo-ceramic, the handpiece has high and long lasting power and generates little heat.
• Detachable handpiece, autoclavable under the high temperature of 135°C and the pressure of 0.22 MPa, avoiding cross infection effectively. Skid proof hand piece. The nipple can be cleaned. The material of the handpiece made in America is appointed as aero plastic components in Europe and America, which is FDA and NSF certificated.
• The cable is made from silica gel tube, soft and durable.
• The scaler tips is made of special material. The cavitation produced form the end of the scaling tip makes the cleaning of teeth and the killing of germ easily, nice and durable. 
• Digitally controlled, automatic frequency tracking ensures that the machine always works on the best frequency and more steadily.
• Eliminating the dental calculus, bacterial plaque and tea scales on the teeth quickly without hurting the gum or the enamel.
• Warranty: One year's free repair for the whole unit from the date of purchase. Lifetime maintenance. 

• Small and light, easy operation.
  
• Eliminating the dental caculus, bacterial plaque and tea scales on the teeth quickly without hurting the gum or the enamel.
• Five pieces of scaler tips attached: 2 pieces of GD1, 1 piece of GD2, 1 piece of GD4, 1 piece of PD1.
• The scaler tip is made of special material. The cavitation produced from the end of scaling makes the cleaning of teeth and the killing of germ easy.
• The SATELEC handpiece is cast from Titanium alloy to ensure sound mechnic function and durability.
• Assembled with excellent piezo-ceramic, the handpiece has high and long lasting power and generates little heat.
• Digitally controlled, automatic frequency tracking ensures that the machine always works on the best frequency and more steadily.
• The new water control switch makes the adjustment of the water more convenient.
• The adjustment range of the amplitude is much wider than before.
• The cable is made from silica gel tube, soft and durable.
• The new solenoid valve can control the water better.
• Warranty: One year's free repair for the whole unit from the date of purchase. Lifetime maintenance.

• FDA and CE0197 Certificated.
• Small and light, easy operation.
• Three functions: Scaling, Perio, Endo.
• SATELEC's handpiece and tips are compatible.
• The handpiece is cast from Titanium alloy to ensure sound mechanic function and durability.
• Assembled with excellent piezo-ceramic, the handpiece has high and long lasting power and generates little heat.
• Detachable handpiece, autoclavable under the high temperature of 135°C and the pressure of 0.22 MPa, avoiding cross infection effectively. Skid proof hand piece. The nipple can be cleaned. The material of the handpiece made in America is appointed as aero plastic components in Europe and America, which is FDA and NSF certificated.
• The cable is made from silica gel tube, soft and durable.
  The scaler tips is made of special material. The cavitation produced form the end of the scaling tip makes the cleaning of teeth and the killing of germ easily, nice and durable.
• Digitally controlled, automatic frequency tracking ensures that the machine always works on the best frequency and more steadily.
• Eliminating the dental calculus, bacterial plaque and tea scales on the teeth quickly without hurting the gum or the enamel.