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How to choose dental floss
Choose a thick floss when you have large gaps.
If you have large spaces between your teeth, pick an extra thick floss. Some options include dental tape or super dental floss.
Choosing a thicker floss will help ensure that you are actually flossing all the surfaces of your teeth and makes flossing easier. You'll know you have gaps if a normal dental floss slides in very easily, and you see ample space around it.