Description: A simple and useful teeth tool for teens and adults. You can train and correct the crowded irregular teeth by using the orthodontic retainer. Apart from that, it can improve facial shape to promote the normal development of jaw if you wear it insistently. Features: Made of food grade silicone material, which is non-toxic, oddless, healthy and safe. No color change, it will maintain the original color and not turn to yellow, whenever how long you use it.Groove design can fit the surface of the teeth well to allow for normal breathing and protection of your teeth during exercise. It can reach to rear molars, to provide complete protection.Invisible color, you can witness tooth change process. It can improve facial shape to promote the normal development of jaw.Can be used as a late addition maintaining for some tooth problems. Specification: Suitable For: Phase I + Phase II Weight: Approx. 20g Type: Teeth Tray Function: Correct Crowded Irregular Teeth How To Use: 1. Hold the trainer with tongue tag up. 2. Place the trainer into the mouth. 3. Keep tongue positioned on the tongue tag. 4. Gently bite down on the trainer. 5. keep lips together and breathe through nose. Color: Transparent Material: Silicone Package Contents: 2*Dental braces