My jaw clicks on one side even though i wear my night guard every night. has been a few years now.

TMJ: The jaw clicks when the disc in the Temporomandibular Joint is displaced. See a dentist who is highly trained in TMJ and occlusion if you're having pain, and also to determine if your condition is causing traumatic bite causing crazing on teeth, which is especially severe on patients with Bruxism and Sleep Apnea.

Monitor: Noise does not mean that the jaw will get worse; it is a greater problem if you have associated headaches or the jaw locks open or closed. See your dentist if these things happen, otherwise don't be overly concerned about the noise. Avoid chewing gum or any habits that cause the clicking.

TMJ syndrome: Temporo-mandibular syndrome is the second most frequent cause of orofacial pain after dental pain. Benign click is not considered a pathology. Proper diagnosis is the key to successful treatment. See Orofacial Pain practitioner for a consultation and treatment options if needed. They are the expert in this field.

No problem: If you are otherwise comfortable with the nightguard, ignore the clicking unless it gets worse, or progresses to locking.