My boyfriend says when i'm sleeping my teeth cling together what does this mean? doesn't hurt in the morning never knew i did this.

Sleep bruxism: is classified as an oromotor movement disorder. Because excessive forces can be generated during SB for extended periods of time, significant loads can be distributed to the teeth and supporting structures and the temporomandibular joints. See your dentist for evaluation and treatment.

Bruxism : This is likely night time bruxism. It is common and usually OKAY. It ranges in severity as many people grind their teeth at night without problems while others experience debilitating chronic pain. Bruxism may or may not have any serious side effects on your dentition and TMJ. To be safe, you can see a dentist to evaluate. Bruxism will also vary with life events, increasing in times of stress.

Clenching: Some people tend to clench their jaws together at night when they sleep. If severe, may consider consulting with a professional.

Bruxism: You are grinding your teeth while you are sleeping. This can cause headaches or facial pain, wear and break teeth, and disrupt your sleep. See a dentist and have your TMJ and your bite evaluated. You would benefit from a nightguard.