You most likely had a traumatic experience. I'll tell you what to do, and please write here whether you have this or not. Move your jaw sharply, very sharply, and quickly close or open your mouth. And write down whether you experience sharp or dull clicks in your temporomandibular joint (TMJ) while doing this. Let me repeat: open your mouth and quickly (very sharply) close it several times, or open it very sharply. The clicks can be sharp or muffled; for you, this may be something normal, so you need to notice them. Please write down if you have this.