Description: A simple and useful toothbrush for teens and adults. You can train and correct crowded irregular teeth with the help of a tooth retainer. In addition, it can improve the shape of your face to promote normal jaw development if you wear it with pressure. Functions: 1. The groove design conforms well to the tooth surface to allow normal breathing and protect the teeth during exercise. 2. It can extend to the back molars for full protection. 3. Visible color, you can observe the tooth change process. 4. It can improve the face shape to promote the normal development of the jaw. 5. It can be used as a late restoration for certain dental problems. Specification: Material: EVA Options: transparent hard Box Size: 6.5 * 4.5cm / 2.6 * 1.8in Weight: 35g Type: Oral Care How to use: 1. Pick up the trainer with the tongue hanger. 2. Place the trainer in your mouth. 3. Keep your tongue on the tongue tag. 4. Gently bite the trainer. 5. keep your lips together and breathe through your nose. Package includes: 1 x tooth holder with box 1. It is recommended that you wear this product for 1-2 hours during the day and 8 hours at night. 2. In the first week, your teeth may feel sore and sore, this is normal you need to use daily. 3. Before and after use, clean with a toothbrush, use cold or warm water, do not use hot water. 4. Suitable for people over 12 years old.