I clench my teeth in my sleep and now my jaw locks. is this bad?

Yes: A 'locking' jaw is usually caused by the disc in the jaw joint becoming malpositioned. This can be caused by clenching or bruxism (grinding the teeth at night). When the jaw 'locks', it can be in an open position or a closed position. This can be treated by a dentist (with oral appliances) who has the proper training and experience.

Lock-jaw: You should seek a tmd/ TMJ specialist because it sounds like some sort of appliance therapy is required, and possibly even surgery . Ask you general dentist or if you don't have one ask an oral surgeon for a referral.

It can be very: My colleagues already have given you some good advice. The main point that i would like to make is that early intervention in these cases often prevents more serious pain and serious complications later on. Some patients have crippling pain and discomfort from long standing TMJ issues. There are conservative treatments. Not all dentist treat this. Get a referral to a skilled tmd dentist.

Get it Checked!: The answers here are very helpful. I would also advise that your dentist consider referral to a physical therapist with tmd management experience. They are excellent at regaining mobility and comfort of the jaw along any dental care provided . I recently had a patient come in with 2 months of closed lock , surprising MRI showed normal disc, and pt got him open in a week.

Yes: See your Dentist for examination and treatment. Before your problem becomes intractable.

Yes Yes Yes: See a TMJ/TMD specialist. Your symptoms may get worse. You may need some oral physical therapy and a mouthpiece.

Nocturnal bruxism: is the medical term for clenching or grinding teeth during sleep. See your dentist for evaluation and night guard fabrication to protect your teeth. Best of luck.