Chewing with incisors for a long time may lead to temporomandibular joint dysfunction and loose teeth. 1. Temporomandibular joint dysfunction: If chewing with incisors for a long time may cause temporomandibular joint to be in the forward position for a long time, the local chewing muscles will be easily fatigued, which will easily induce temporomandibular joint dysfunction. At this time, the patient will have pain in opening or closing the mouth, joint popping, difficulty in opening the mouth, pain in the temporomandibular joint area and other manifestations. 2. Induce tooth loosening: the main function of incisors is to cut food, chewing with incisors for a long time will increase the local burden, and some patients may experience tooth loosening or tooth loss. It is recommended not to chew with incisors for a long time, but to chew food with molars, and avoid chewing food with one side of the teeth for a long time, and need to change the part of chewing food frequently.