How to solve the problem of tooth root blackening

Teeth root blackening needs to determine what blackening substances are, if due to periodontitis caused by gum recession, dental calculus in the root of the black, routine cleaning treatment, removal of black dental calculus, you can remove teeth root blackening. If the root of the tooth is black due to caries, pure cleaning is not possible. The blackening caused by caries is infected by bacteria and erodes the tooth tissue. Especially the elderly are prone to gum recession, cementum exposure, cementum hardness is small, and it is more likely to be destroyed by bacteria to cause caries.