How can i tell if i have an infection because of my tooth?

Maybe: Sorry, but this can't be diagnosed over the internet. See a local dentist to know for sure.

Possible: Depending on where the pain is, it is very possible that an infection could be caused from a tooth. Sometimes a sinus infection can mimic a toothache, but a proper exam and radiograph would be needed to correctly diagnose and treat the source and cause of your infection. Keep smiling !