Lockjaw (trismus) is a painful condition that limits your ability to open your mouth all the way. It occurs when the muscles you use to chew spasm, meaning they can’t relax completely. The term ...

Dolphins are known for what appear to be big, contagious smiles. But do they actually, well, smile? The answer, according to a new study of dolphin play, is a resounding “maybe.” Dolphins use their ...

T aping your mouth shut while sleeping might not sound appealing. But its proponents claim a vast array of benefits, from ...

Dear Eric: I play cards weekly with a group. One of the women sometimes chews gum during our games, noisily and with her mouth open. This is worse than fingernails on a chalkboard to me. Why do ...

It took four medical personnel to put Jenna Sinatra's jaw back in place. Her head was also wrapped so her jaw would stay shut. A New Jersey woman found herself dealing with an extreme case of lockjaw ...

Nature is full of weird specimens. Animals have developed strange, almost supernatural, abilities to hunt and survive. For example, the star-nosed mole can smell underwater. There are species of ...