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 ...

That slightly open mouth while concentrating. The subtle parting of lips during sleep. The tendency to breathe through your mouth instead of your nose during exercise. These seemingly innocent habits ...

Mouth breathers get a bad rap, especially when it comes to sleep. Luckily, there’s a trend that could save them (and their loved ones) from enduring another night of snoring and bad breath: mouth ...