I fractured my jaw when i was 12 years old. i am now 23, and my jaw pops a lot when i chew, and it also makes a clicking sound?

Physics in the mouth: There are many possible answers to this question. The short answer is that your teeth may not be coming together properly. There are also many reasons for this. The joint where your jaw bone connects to your skull may be the culprit. It could be inflamed or have an anatomical issue. A good dentist would be a great place to start.

Broken jaw: Many things can affect the jaw joint. Whether there was an issue created when you broke your jaw, an occlusion issue or a functional issue needs to be determined. Popping and clicking alone without pain or affected function is not necc. An issue. See a qualified dentist to evaluate your bite, TMJ and for any possible treatment.

TMJ symptoms: Your symptoms are possibly myofacial pain syndrome, that is, clenching grinding causing muscular pain versus an internal joint problem. You need to see an oral/maxillofacial surgeon with training in tmj. They may order an mri. Treatment may either be a splint(retainer), physical therapy, medicine or arthroscopy (minor procedure). Most patients get better.

Jaw disk displaced: Having popping/clicking TMJ noises not necessarily a problem. Many people experience these noises. Without pain or limitation of function the noise itself is not an issue. If you have locking or limited movement, "ear" pain, headaches, morning jaw stiffness/soreness, difficulty chewing, bruxism, previous jaw injuries or other jaw conditions, the problem is more serious. Then see a TMJ specialist.