Which of the following is the most important preventive therapy for an 8 year old living in a non-fluoridated community, with closed contacts in the posterior quadrants and disto-occlusal restorations on all primary first molars?
Twice daily brushing with fluoride toothpaste.
Weekly 0.2% NaF rinse.
Fluoride varnish at 1 month intervals.
Daily sodium bicarbonate rinse.
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