dental与tooth的区别
dental: adj.牙科的;牙齿的; n. 齿音
Good oral hygiene and regular dental care are important, whatever your age.无论年龄大小，良好的口腔卫生和定期的牙齿保健都非常重要。
tooth: n.牙齿; vt. 给……装齿; vi.啮合
If a tooth feels very loose, yiur dentist may recommend that It\'s taken out.如果有牙齿非常松动，你的牙医可能建议你拔掉。