Disk. The joint disk is out of position. No treatment required unless getting louder, joint pain, jaw locking. If so, see TMJ expert. Any dentist can be a TMJ expert with the proper training and experience. Most commonly, oral surgeons, prosthodontists, and orofacial pain specialists. Ask your MD, your dentist and your dental society for referrals.
TMJ noise. As you open your mouth, the jaw slides forward. The meniscus in your TMJ goes forward then snaps back with a popping sound. If you have no pain or limitation in opening your mouth, it is all normal!
Glad you asked. While the presence of joint sounds implies that some mechanical disturbance is present in the joint, it does not mean that treatment is required. Many patients with joint noise are able to adapt to structural changes within the joint and have a full, pain-free range of motion. Especially if cone beam ct is within normal limits.