High-quality materialsmade of medical-grade polycarbonate. The edges are smoothed and these are comfortable to wear. Widely used: The mouth opener is suitable for home use and also for dental use.It can avoid the problem of sensitive gums during teeth whitening treatment.The teeth cheek retractor in several sizes helps to keep whitening agents away from lips and gums. C-shape design - Ergonomic to use, high anastomosis with the mouth. Helps you have an unobstructed view of the oral cavity. Pleasant to use: The smooth edges of the intraoral mouth opener for teeth whitening make it very comfortable to wear and help you get an unobstructed view of your mouth.Mouth expanders are suitable for whitening teeth, preventing grinding and protecting teeth. Fuction: It can be used for general dental purposes, can also be used as a fun gift or toy, watch your friends smile and laugh.