The average person spends less than 30 seconds brushing his teeth, but a recent study shows that 5.1 minutes is the ideal amount of time to spend for cutting plaque down to satisfactory levels. Thirty seconds removes only 10 percent of the plaque; 90 seconds, only 20 percent; and 150 seconds, only 25 percent. If you can't spare a full five minutes for brushing, three is acceptable. Of course, you should floss in addition.
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