Features 1、Groove design can fit the surface of the teeth well to allow for normal breathing and protection of your teeth during exercise 2、It can reach to rear molars, providing complete protection 3、Invisible color, you can witness tooth change process 4、It can improve facial shape to promote the normal development of jaw 5、Can be used as a late addition maintaining for some tooth problems Specification Description: A simple and useful teeth tool for teens and adults. You can train and correct the crowded irregular teeth by using the teeth retainer. Apart from that, it can improve facial shape to promote the normal development of jaw if you wear it insistently. Features: 1. Groove design can fit the surface of the teeth well to allow for normal breathing and protection of your teeth during exercise. 2. It can reach to rear molars, to provide complete protection. 3. Visible color, you can witness tooth change process. 4. It can improve facial shape to promote the normal development of jaw. 5. Can be used as a late addition maintaining for some tooth problems. Specification: Material: EVA Options: Blue Soft, Transparent Hard, Transparent Soft Box Size: 6.5 * 4.5cm / 2.6 * 1.8inch Weight: 35g Type: Oral Care 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. Package Include: 1 x Teeth Retainer With Box Note: 1.It is recommended to wear this item for 1-2 hours during the day and 8 hours at night. 2.At first week, your teeth may feel pain and sore, this is normal, you need to keep on using everyday. 3.Before and after use them, please clean with a toothbrush use cold or warm water, do not use hot water. 4.Suitable for people who is above 12 years.