如果你牙疼，你可以说: "I have a toothache."

这句话的来源是源于人们在日常生活中对牙疼的描述。

下面是一些英文例句和中文翻译：

"I can't sleep because of my toothache." (我因为牙疼而睡不着觉。)

"I need to see a dentist because of my toothache." (我需要看牙医因为我牙疼。)

"My toothache is getting worse." (我的牙疼越来越糟。)

希望这些信息对你有帮助！