The part of the tooth exposed in the oral cavity is called the crown, the part buried in the alveolar cavity is called the root, the junction between the two is called the neck of the tooth, and the whole tooth is called the tooth body. The tooth surface on which food is chewed is called the occlusal surface. Enamel and cementum cover the crown and root surfaces respectively, and the inner layer is dentin. There is a pulp cavity in dentin, which communicates with periodontal tissue through apical foramen. Periodontal tissue consists of periodontal ligament, alveolar bone and gum. All kinds of food that people need for survival must be chewed with their teeth before entering the digestive system to absorb nutrients. So it is very important for people's health. Although the reason is simple, it is not a word to really do a good job in daily dental care. The ancients attached great importance to the health care of teeth and mouth. Su Dongpo, a writer in the Northern Song Dynasty, has a set of regimen. He gets up early every day and sits cross-legged in a quiet place, that is, he has to knock his teeth up and down ten times first, then slowly swallow the body fluids in his mouth and exercise his teeth. The Code for Disciples of the Qing Dynasty also discusses oral hygiene: "Wash your face, rinse your mouth, urinate and wash your hands in the morning." Nowadays, the living standard has been greatly improved, people eat more and more fine food, and there are fewer and fewer opportunities to exercise their teeth. In particular, eating more sugar and sweets makes tooth tissue prone to illness, and even causes premature muscle atrophy of tooth tissue.
In order to keep your teeth and muscles healthy, you should massage your teeth two or three times a day. Touch the upper and lower gum muscles with your fingers from the outside and massage several times every time you knock on the front and back teeth. Long-term persistence will be beneficial. Make the small blood vessels of periodontal tissue circulate smoothly, enhance the resistance of periodontal tissue and make teeth firm.
As the saying goes, "toothache is not a disease, but it hurts like hell." Because teeth are closely connected with nerves. So toothache is inevitable.