Yes, there is reason for concern. The popping comes from the Temporomandibular Joint (TMJ), which is made up of the muscles and bone of the fossa and condyle with a disc that cushions and separates them. When the jaw muscles are working overtime there is extra stress pulling on the disc. This continuous tension will cause the disc to stay out of place. When you open your mouth, the disc pops back into place and when you close your mouth, the disc slips back out.