Which of the following is an irregular, rounded depression or concavity found on the surface of a tooth?
  1. Pit
  2. Groove
  3. Fossa
  4. Tubercle
Explanation
Answer: C - A fossa is an irregular, rounded depression or concavity found on the surface of a tooth. A lingual fossa is found on the lingual surface of incisors. A central fossa is found on the occlusal surface of a molar.
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