noun which may take the genitive case particle 'no'
periodontal; parodontal
Medical term used attributively to refer to tissues surrounding and supporting the teeth. Common in compounds like 歯周病 (periodontal disease).
It is important to maintain the health of the periodontal tissues.
When periodontal pockets deepen, periodontal disease progresses.
periodontitis
periodontal disease; gum disease
periodontics
periodontal pocket
Compound of 歯 (tooth) and 周 (surroundings), literally 'around the tooth'. A modern medical coinage.