Toothache in English is commonly known as "toothache". It comes from the combination of the words "tooth" and "ache", which refer to the tooth and the pain it causes, respectively. Here are some examples of how to use the term in a sentence:

"I have a terrible toothache that won't go away."

"The dentist said I need to have a filling for my toothache."

"I took some painkillers for my toothache, but they didn't help."

"My toothache is so bad that I can't eat anything."

"I'm going to the dentist tomorrow to get my toothache checked out."