The temporomandibular joint (TMJ) is the hinge-like bone that connects your jaw and your skull. You can feel it moving by pressing your index fingers to your cheeks and opening and closing your mouth.

If your jaw is stiff, opt for heat. Gonchar says this can help relax tight muscles and improve blood circulation to ease aches. A 2015 review in CoDAS backs her up-the scientists found 20 minutes ...