You may have Temporomandibular Disorder (TMD). If you have pain when you chew or yawn, it is generally a sign of TMD.
Next Steps
Massage the areas around your jaws to relieve muscle tightness and enhance blood flow to the area.
Health Tips
When you feel occasional sharp pain in your jaw joints, apply a pair of cold packs. The cold numbs your nerves, dulling pain messages that go to your brain. Wrap a couple of soft packs in thin towels and hold them on both sides of your face for about 10 minutes or so