For inside surfaces of front teeth: Hold your brush vertically and use up-and-down strokes

For all other teeth surfaces: Place your brush at a 45-degree angle to the gums. Brush back and forth in short, gentle strokes.

Note: A good brushing takes at least two minutes; do it twice a day. Brush your tongue each time as well to help keep bacteria at bay.

Source: AARP bulletin October 2018

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