Mouthguard is an elastic device covering the maxillary dentition, which can buffer, absorb and disperse the impact force. It has been proved to have a definite protective effect on reducing oral and maxillofacial sports injury. However, due to the general weakness of the national awareness of oral movement protection, there is also confusion in the choice of mouthguard. This article reviews the classification and selection of mouthguard, materials, design requirements and extended applications of mouthguard, in order to provide reference for the promotion and application of mouthguard