Here is a worksheet on the Latin word roots dent and denti. Would you be terribly surprised that they mean, respectively, tooth and teeth?
This is a very productive root in English, and one particularly useful for student considering healthcare careers, especially, uh, dentistry.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.