Modern people are known to have periodontal disease, so more than 80% of people in their 30s and older have periodontal disease.

Meanwhile, in modern times, various mental illnesses caused by stress are becoming a serious problem because many people are exposed to various stresses.

Periodontal disease and stress. These two problems, which threaten the healthy lives of modern people, are not independent, but deeply related to each other, according to a recent study.