This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
The best method to prevent initiation of caries in a four¬year-old child who has no accessibility to community water fluoridation is: 
Select and explain. 
A. Brushing and flossing, B. 2.2% NaF tablet daily, C. 0.05% NaF mouthwash daily, D. 0.5% NaF toothpaste daily
B: 2.2% NaF tablet daily
Answer: B: 2.2% NaF tablet daily 
Explanation: None