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2. ADA 2014a Healthy Mouth http://www.mouthhealthy.org/en/az-topics/b/brushing-your-teeth
3. ADA 2014b Statement on Toothbrush Care: Cleaning, Storage and Replacement http://www.ada.org/1887.aspx
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5. AMSTAR 2007 Checklist http://amstar.ca/Amstar_Checklist.php