Temporomandibular joint disorder syndromes tend to resolve spontaneously in the early stages, but not in the middle or late stages and require treatment. The development of TMJ disorder includes three stages, the functional disorder stage, the structural disorder stage, and the organic lesion of the joint. Early temporomandibular joint disorder, i.e., the functional disorder stage, is a preclinical state and can usually be self-healed. In the middle and late stages, structural disorders and organic lesions cannot be cured by themselves, and physical therapy or surgery is needed to alleviate them. It is important to change bad habits to protect the joints, such as biting off half of an apple and opening a bottle cap with your teeth. If you suspect that you have temporomandibular joint disorder syndrome, you should clarify the severity of the disease and the treatment plan under the guidance of your doctor.