Comfort and safety: this tooth bowl is made of food-safe silicone material, which is non-toxic, unusual, healthy and safe. Ensuring the highest level of comfort and safety. Professional design: the groove design can fit well on the surface of the teeth to allow normal breathing and protection of your teeth during training. It can reach up to the back molars to provide complete protection. Transparent tooth trainer: with invisible colour, you can observe the change of teeth. No color change, the original color will be retained and will not turn yellow when you use it. Multi-purpose - It can improve the face shape to promote normal development of the jaw. Can also be used as a late addition to some dental problems. Easy to use: simply hold the trainer up with the tongue pendant, put the trainer in the mouth, hold the tongue on the tongue pendant and then gently bite the trainer. Hold the lips together and breathe through the nose. Weiyiroty tries our best to improve product quality and 100% satisfaction service.