Can a cavity in the tooth root be filled?

When the cavity on the tooth root is shallow, the root is stable, and there is no severe inflammation, it can be filled. However, if the cavity is deep enough to expose the pulp, or if the root is loose or there is severe inflammation, direct filling is not feasible and other treatments are required.

If the cavity on the tooth root is limited to the superficial or middle layer of dentin and has not reached the pulp, and examination confirms no significant root resorption or mobility, as well as no signs of inflammation such as redness or pus discharge in the gums, restorative filling may be performed. The dentist will first remove the decayed tissue within the cavity, then fill it with a biocompatible material to restore the root's shape and prevent further progression of the disease.

If the cavity is deep and has already penetrated into the pulp causing pulpitis, or is accompanied by significant pain, recurrent gum swelling, or even noticeable root resorption and looseness, direct filling is not possible. Root canal treatment must first be performed to eliminate the infection. If the root cannot be preserved after treatment, extraction followed by restoration should be considered to prevent the spread of infection to adjacent teeth.

In daily oral care, it is important to brush thoroughly with a soft-bristled toothbrush both morning and night, paying special attention to cleaning the root areas. Use dental floss or a water flosser to clean between teeth and reduce food debris accumulation. Regular dental check-ups are essential—any abnormalities in the tooth roots should be addressed promptly to prevent small cavities from becoming larger problems.