You should floss your teeth at least once a day. Flossing in between your teeth removes food debris and plaque from in between the teeth that a toothbrush can't reach. Plaque causes tooth decay and can lead to gum disease. Another great reason to floss is that recent studies have shown that flossing helps to prevent a heart attack or stroke.
When flossing, be sure to gently insert the floss in between the teeth, without snapping, which could damage the gum tissue. Gently move the floss up and down into the spaces between the gum and teeth. Floss the sides of all of your teeth, even if there isn't a tooth next to another one. There are a number of dental products available that are designed to make flossing easier, such as disposable dental flossers.