Do I really need to floss? - Smile Exchange
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Of course you need to floss! Flossing is the primary way to get food particles in between your teeth that brushing itself can’t get. This helps reduce plaque buildup which can cause painful cavities in between your teeth. It also helps prevent buildup of plaque and bacteria along the gum line, which may reduce your risk of periodontal disease.

To floss properly, take about a foot or so of floss and wrap around your hands and gently glide the floss around your teeth. Keep in mind to not just go up and down, but really back and forth so you can remove the food particles from in-between your teeth. And, make sure you’re using a new section of floss each time so you aren’t just moving the plaque and bacteria around your mouth.
But, don’t floss to hard, as that can lead to bleeding gums which are more susceptible to infection.

Flossing is just one part of your regular oral health routine, which should also include brushing twice a day and visiting your dentist regularly.

Source: https://www.colgate.com/en-us/oral-health/basics/brushing-and-flossing/how-to-brush-your-teeth-floss-and-eat-properly-for-optimal-dental-health-0314