The danger of dental calculus is that it can cause periodontal disease, cause bad breath, etc., and in serious cases, it may cause alveolar bone atrophy, tooth loss and even stimulate the gums to produce tumors, etc. It is recommended to clean up dental calculus regularly. 1. Calculus is the product of plaque mineralization, the texture is relatively hard, and will stimulate the gums to appear local inflammation, may bleed. The alveolar bone will continue to consume itself in the process of resisting the aggression of dental calculus, and the phenomenon of alveolar bone shrinkage will occur, and the gums will also produce a corresponding recession. 2. Teeth grow in the alveolar bone wrapped in the alveolar fossa, alveolar bone shrinkage will cause teeth loosening, the danger is so great that the teeth fall out. 3. Dental calculus constantly stimulate the gums, no timely disposal, may cause gingival tumor. It is recommended to clean the calculus regularly and quit the bad habits such as not brushing teeth, smoking and drinking alcohol.