Dental Colonization of a new smooth surface of a tooth will occur by S. mutans when its level in the oral cavity reaches: A >105/ml B 4.5 x 104/ml C 3.5 x 103/ml D 5.5 x 102/ml 💡 Explanation Colonization of a new smooth surface of a tooth will occur by S. mutans when its level in the oral cavity reaches: ✓ Correct Answer: B. 4.5 x 104/ml