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 ...

These days, all fish have teeth. The shapes of their teeth vary according to diet, ranging from the little pegs of goldfish ...

Even the gentlest sip of a cold drink can send a jolt through our teeth. That familiar sting, long thought to be a side effect of enamel wear, might instead hint at something far more ancient — the ...