n. 〔pl.〕 〔动词用单数〕牙周病学 (＝periodontia)。 adj. -dontic n. -dontist 牙周病学家，牙周病医师。
Example Sentences:
1.
Her teeth , as her thirties wore on , gave her trouble , and the orthodontics and periodontics specialists she regularly consulted had their offices in the nearby middle - sized city , in a tall building across from the one in which les worked as an investment counsellor 三十好几之后，牙齿开始找她的麻烦；她经常去咨询的正牙专家和牙周病专家的办公室就处在附近的那座中型城市，他们办公的那栋高楼正好座落在他担任投资顾问上班的那幢大楼对面。
