Mouth Guard: Professional two stages mouth guard, designed for kids The first stage Mouth tray is softer and is used adapt to tray and primary straightening; The second stage Mouth tray is harder and is suitable for increasing the straightening force and further straightening. Material: High quality TPE material, invisible transparent appearance, reliable and durable. Easy to Use: Used during daytime and nighttime, wearing 1-2 hours during the day and 8 hours at night. The kids can use it at bedtime, during the daytime study, traveling, etc. Comfortable: Comfortable and effective to wear, help get a tighter and fit, turning your irregular Mouth or grinding Mouth to tidy and straightened Mouth. Maintenance: The Mouth retainer can be cleaned with a toothbrush and toothpaste. When not wearing, need to put the Mouth tray into the storage box. Specification: Product size: 6cmx4.1cm/2.36inchx1.61inch Material: TPE Package Includes: 1 Mouth Guard Note: Please allow slightly errors due to manual measurement and different monitors.