Dental How long does it take for incipient caries to develop into clinically evident smooth surface caries? A 9 ± 6 months B 2 + 6 months C 18 + 6 months D 24 ± 6 months 💡 Explanation How long does it take for incipient caries to develop into clinically evident smooth surface caries? ✓ Correct Answer: C. 18 + 6 months