If the calculus only presses on the gums, the gap where the calculus has fallen off after cleaning usually gets better. If dental calculus lead to periodontal tissue atrophy, after cleaning dental calculus dropped gap usually can not get better. 1. The formation of dental calculus only oppressed to the gums and gums caused by localized shrinkage, no periodontal disease, in the teeth after cleaning calculus off, calculus on the gums of the pressure disappeared, the gums can usually be slowly restored. 2. When the patient suffers from periodontitis and other diseases, the pressure of calculus to the root of the teeth around the alveolar bone is compressed, resulting in significant periodontal tissue shrinkage, making the gap between the teeth become larger. In this case, dental cleaning calculus washed off, the gap between the teeth is usually unable to recover, can be improved through the membrane gum surgery. The emergence of dental calculus, dental cleaning need to choose a formal hospital operation, to avoid further damage to the gums, teeth and so on.