Also known as gum disease, periodontal disease or periodontitis affects the connective tissue that links the teeth to the bone, its main symptom being progressive bone loss. Left untreated, periodontitis leads eventually to the loss of the teeth.

This disease is characterized by massive bacteria growths located either between the teeth or along the gum line. In severe cases, teeth start to become loose, the ultimate consequence being their loss. About 50% of all people over 30 years of age suffer from a mild form of periodontal disease.