The masseter is the most superficial muscle of mastication, easily felt when the jaw is clenched.

Trigger Point Indications, include:

Trismus (severely restricted jaw), TMJ pain, tension/stress headache, ear pain, ipsilateral tinnitus, dental pain, bruxism, sinusitis pain, puffiness under the eyes (often present in singers).

Typical Causes:

Chewing gum, tooth grinding/ bruxism, prolonged dental work, stress, emotional tension, head- forward postures, occupation.