First appearance of tooth formation occurs in____________?
Correct answer: A. 6th week IU
- A. 6th week IU
- B. 2nd week IU
- C. 9th week IU
- D. 4th week IU
Explanation
The first visible sign of tooth development is formation of the dental lamina during approximately the sixth intrauterine week. The earlier weeks listed precede initiation of the tooth germ.
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