Hi there! Welcome to the English language! It's great to hear that you're starting to learn.
The singular word for "teeth" is "tooth." So, if you're talking about one tooth, you would say "I have a toothache" instead of "I have a teethache."
English can be a tricky language to learn, especially with irregular plurals like "teeth." Just remember to keep practicing and don't be afraid to ask for help when you need it. Good luck with your studies!
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