Suitable for all ages: Mouth Opener is suitable for most people. The green size is too large, suitable for adults. Blue medium blocks, suitable for children or adults with small mouths. Finally, the purple trumpet is suitable for pediatrics.^High quality: Mouth Opener is made of high-quality plastic, clean and hygienic, it can be reused safely, it is not easy to be deformed, and it has no peculiar smell.^The ideal choice for dentists: Use Mouth Opener to easily avoid patient fatigue and allow patients to enjoy relaxing therapy.^Stable positioning: Mouth Opener prevents tongue movement duannulus therapy to avoid injury.^3 sizes are suitable for all ages: S, L, M sizes and 3 colors, suitable for different patients. You can choose the size of the cheek corrector you need.