Two minutes are the recommended amount. Most of the expensive electrical brushes have a built-in timer set to that length.
Brushing too much, or with too much force, can cause gum recession. I recently switched dentists from one whom I had been seeing for over a decade, and the new one was shocked at how much my gums had receded.
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'13 McMaster Alumni
B.A. Political Science
JET Programme Canada, ALT
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