You experience swelling at the base of your gums or experience minor pain when chewing. The surface of your teeth becomes darkened with black or brown spots. Perhaps you experience continual pain in your mouth or nasal passage. Be careful--you've got a cavity.
牙齒對冷、熱、甜食特別敏感，牙齦下有浮腫、吃東西咀嚼時有輕微疼痛，牙面上有黑棕色斑點，口腔或鼻竇中有持續性疼痛… …，要小心，你有蛀牙了。