Toothworms in the teeth need dentists to use high-speed turbine handpieces to grind away the diseased teeth, remove the decayed material and then fill the cavities. 1. Dental caries is a disease in which the hard tissues of the dentition are chronically and progressively destroyed under the action of various factors, mainly bacteria. Clinical features are color, shape, texture changes, tooth replacement feeling abnormal, caries can only be removed by removing the decayed material, can not be treated by other means, such as the use of chemicals. 2. The color of caries is chalky in the early stage, and further staining is brownish yellow or blackish brown. Caries texture after demineralization of hard tissues will decrease in hardness, soft texture, easy to find when probing. In severe cases, the shape will be defective. The hard ones can be removed by grinding with a high-speed handpiece, and the soft ones can be removed by scraping with a spatula until the decayed material is removed. 3. Dental caries is a process in which caries-causing bacteria metabolize sugar and produce acid in the plaque environment to form polysaccharides and acids that dissolve the hard tissues of the teeth to form cavities. Oral hygiene should be maintained continuously to prevent caries not only in other teeth but also in the filled teeth. After removing the decayed material, the missing part of the tooth should be filled to restore its shape. Maintaining intraoral hygiene and regular oral checkups can reduce the incidence of caries or reduce the risk of aggravation of caries with a high probability.