Medically reviewed by Edmund Khoo, DDS 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 ...

Sleeping with your mouth open can lead to various health issues, including dry mouth, tooth decay, and sleep disruption. Nasal congestion, structural problems, and sleep apnea are common causes ...

Mouth or facial exercises can help stop open-mouth sleeping. It can look or feel awkward, but it's something you can do to relax the jaw.

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 ...

In today's Asking Eric column, R. Eric Thomas responds to someone who doesn't understand why people chew with their mouth open.