Which symptom would strongly indicate osteonecrosis of the jaw rather than a typical dental abscess?

• A. Exposed bone
• B. Toothache only
• C. Gum bleeding
• D. Bad breath

Answer: (A)

Exposed bone is the distinguishing feature of osteonecrosis of the jaw. When bone is necrotic in the jaw, the overlying tissue may break down and reveal the underlying bone, often persisting for weeks and sometimes following dental procedures, radiation, or antiresorptive therapy. This specific sign sets ONJ apart from a typical dental abscess, where the problem is infection around a tooth and presents with pain, swelling, and sometimes pus, but the bone itself usually isn’t visibly exposed early on.

Other signs like toothache alone, gum bleeding, or bad breath are common in many dental conditions (gum disease, simple infections, or poor oral hygiene) and don’t point specifically to bone necrosis.