A: What's the matter with you? 你怎么啦？ B: This tooth hurts. 这颗牙疼。 A: Let me have a look. 让我看看。
A: Your tooth has an abscess. 你的牙齿有脓肿。 B: My gum also hurts me. 我的牙龈也疼。 A: It seems that there is an infection. 似乎是感染。