Don't ferget the ear as a potential etiology. Ear and jaw share pain fibers on the hypoglossal nerve.
Here's my quick and dirty "it's 3 am and I have to call my attending jaw pain cheat sheet:
• Dental caries or abscess
• Sinusitis
• Temporal arteritis
• Trigeminal neuralgia
• Temporomandibular joint (TMJ) syndrome
• Migraine
• Sialadenitis (eg, parotitis)
• Sialolithiasis (salivary gland calculi)
• Otitis media
• Orbital or periorbital cellulitis
• Peritonsillar abscess
• Ludwig’s angina (retropharyngeal infection)
• Carotid artery dissection
• Glossopharyngeal neuralgia
• Atypical facial pain
• Postherpetic neuralgia
• Bruxism (teeth grinding)
• Dental misalignment
• Acoustic neuroma
• Trauma
• Glaucoma
• Dacryocystitis (lacrimal sac infection)
• Angina pectoris
• Numb chin syndrome (mental neuropathy) due to malignancy in mandible