After research, seeing different doctors and realizing that I had experienced previous problems with this (and had stopped wearing night mouthguard), I went to dentist for a new mouthguard. I have bruxism (
grinding of
teeth, mostly at night) (a common problem) and have had it for years. It leads to TMJ, which can cause many different problems, swelling, pain, numbness, deafness, blindness, etc. It is so important to wear your night mouthguard.