A patient presents with swelling and pain in the upper anterior region of the maxilla associated with tooth #9. What is the most important concern regarding potential spread of infection from this area?

Correct answer: C. Orbital cellulitis / eye infection

• A. Ludwig's angina is a bilateral submandibular/sublingual/submental space infection typically arising from mandibular molar infections, not maxillary anterior teeth.
• B. The facial nerve runs through the parotid gland region and is not directly threatened by spread from upper anterior tooth infections in the usual pathways.
• C. CORRECT. Infections from maxillary anterior teeth (especially #8–10) can spread superiorly into the canine space and then into the orbit (angular vein / facial vein → ophthalmic vein), causing orbital cellulitis or even cavernous sinus thrombosis. The most immediate dangerous spread from upper anterior infections is toward the eye.
• D. Cavernous sinus thrombosis is a serious complication but is a downstream consequence; the immediate/primary concern is orbital spread via the angular-facial-ophthalmic venous pathway.