Dental Knutson’s technique of fluoride application is done the following years: A 3, 7, 11, 13 B 2, 6, 10, 16 C 8, 13, 18, 31 D 2, 7, 11, 18 💡 Explanation Knutson's technique of fluoride application is done the following years: ✓ Correct Answer: A. 3, 7, 11, 13