noun
periodontal pocket
A dental term referring to the deepened space between a tooth and the surrounding gum, often associated with periodontitis.
歯周ポケットが深いと、歯周病が進行している可能性があります。
If the periodontal pocket is deep, periodontitis may be progressing.
歯周病 is the general term for periodontal disease, while 歯周ポケット refers specifically to the anatomical pocket that forms as a result of the disease.
Compound of 歯周 (ししゅう, 'periodontal') and ポケット ('pocket'), a direct calque of the English dental term 'periodontal pocket'.