Why did a tooth suddenly fall out?

1) cracked teeth. Bite hard things, such as walnuts, pine nuts and other foods, there is sand in the rice, and even friends who make phone calls while eating, and then bite chopsticks, may cause the teeth to split. 2) Dead pulp teeth become brittle. When the tooth is a dead pulp tooth after root canal treatment, the texture of the tooth will become brittle and the risk of splitting will be greater due to lack of nutrition. It may be that normal chewing or biting a slightly hard food may lead to tooth splitting. Only one cusp is cracked, or only the crown is cracked, and there is still a chance to repair it. If the crack is deeper and deeper than the root, there may be no chance to repair it, and finally it will have to be removed. 3) Long-term wear leads to thin wall and weak tip. Some middle-aged and elderly people chew hard things for a long time, and their teeth are severely worn, forming some thin-walled and weak tips, which are also easy to split and break during normal use. 4) There is no undercoat caused by dental caries. Some dental caries can easily lead to corrosion and emptiness inside the teeth, while the enamel on the surface is intact. At this time, there is no support under the enamel, so it is not glazed. The bottomless glaze is easy to break under the action of biting force. For example, dental caries start from the adjacent surface and develop horizontally, causing internal corrosion of teeth. The enamel on the occlusal surface looks intact and may suddenly break when chewing food. 5) The tartar is stripped from the tooth surface. After calcification, bacteria and food residues left on the tooth surface will form tartar on the tooth surface, and the tartar will be flat and full of teeth. Careless friends are not easy to find and think they are part of the teeth. The more calculus accumulates, the thicker it will be. At a certain moment, the thick calculus may peel off from the tooth surface under the action of chewing and other forces, and it will be mistaken for a tooth. No matter which of the above causes leads to tooth loss, you should go to the hospital for examination in time and treat it differently according to different situations.