Provided are: a pharmaceutical composition for preventing or treating periodontal disease, said composition comprising tauroursodeoxycholic acid as an active ingredient; and a composition for improving oral hygiene.L'invention concerne : une composition pharmaceutique destinée à la prévention ou au traitement de la maladie parodontale, ladite composition comprenant de l'acide tauro-ursodésoxycholique comme principe actif ; et une composition destinée à l'amélioration de l'hygiène buccale.타우로우루소데옥시콜릭산을 유효성분으로 포함하는 치주질환의 예방 또는 치료용 약학 조성물; 또는 구강위생 증진용 조성물을 제공한다.