Parafunction of the teeth is a term used to describe any activity that puts an abnormal or excessive amount of force on the teeth. This can include clenching or grinding the teeth, nail biting, tongue thrusting, and other habits that can contribute to the destruction of the teeth, gums, and jaw joint. Parafunction of the teeth can cause pain, headaches, damage to the enamel, and TMJ (temporomandibular joint) dysfunction. If you suspect that you have a parafunctional habit, it is important to speak to your dentist about it so that it can be addressed.