I've got a toothache. 我牙疼。
I can't eat anything. 我什么都吃不了。
Could you check my teeth? 你能检查一下我的牙齿吗?
Please open your mouth wide and let me have a look. 请张大嘴巴，让我看一下。Which one is painful? 哪一颗牙疼呢?
You have a cavity. 你有一颗蛀牙。
Please rinse your mouth. 请漱漱口。
I will fill the cavity for you. 我会给你扑上。
You will need root canals. 你需要进行压根管治疗。
Perhaps you need teeth implants. 或许你需要植牙。
Before the teeth implant procedure, you need to take anti-inflammatories. 植牙之前，你需要吃消炎药。
Local anaesthesia will be used to numb the area before the procedure. 手术之前会先进行局部麻醉。
This procedure requires 3 separate visits. 这个治疗需要就诊三次。
Remember to brush your teeth after every meal. 记得每一餐之后都要刷牙。
Here is the pamphlet that shows you the correct way of brushing your teeth. 这个小册子教你如何正确刷牙。
肠胃毛病常用的句子：
He has a bloated, uncomfortable feeling after meal. 他饭后肚子觉得胀胀的，很不舒服。He has bouts of abdominal pain. 他有一阵阵的肚痛。
He feels bloated in his abdominal area. 他感到肚子胀胀的。注：胀胀的，像（puff up），