A new study reveals that the sensitivity of teeth, which makes them zing in a dentist's chair or ache after biting into something cold, can be traced back to the exoskeletons of ancient, armored fish.

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Teeth first evolved as sensory organs, not for chewing, according to a new analysis of animal fossils. The first tooth-like structures seem to have been sensitive nodules on the skin of early fish ...

Why are our teeth so sensitive? The answer originates in the armored skin of ancient fish. If you’ve ever experienced dental pain, you've probably wondered why our teeth would evolve to function like ...