Anatomy & Histology · single question
How long after tooth eruption is root formation complete?
Show answer and explanation
Correct answer: B. 2–3 years after eruption
- A. Incorrect. 2 months is far too soon — the root apex is still wide open at this point.
- B. Correct. Root formation is typically completed 2–3 YEARS AFTER TOOTH ERUPTION. When a tooth first erupts, the root is incompletely formed with an open apex (Blunderbuss canal). Over 2–3 years, the apex gradually closes. This is important clinically — apexogenesis aims to preserve vitality to allow this natural completion.
- C. Incorrect. 8 years far exceeds the typical timeframe for root completion.
- D. Incorrect. 3–4 years is slightly beyond the typical range, though some teeth may take up to 3 years.
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