根的英語翻譯：

base; cause; foot; origin; radix; root; source
【化】 radical
【醫(yī)】 rad.; radical; radices; radix; rhizo-; root

尖的英語翻譯：

needle; piercing; point; sharp; the best of its kind; tip; top
【醫(yī)】 apex; apices; apico-; cusp; cuspis; mucro; point; puncta; punctum; tip

牙周炎的英語翻譯：

【醫(yī)】 dental arthritis; Fauchard's disease; gingivopericementitis
osteoperiostitis alveolodental; paradentitis; parodontitis
peridentitis; periodontal inflammation; periodontitis