Plaque loves to hide between your teeth, and even the most meticulous tooth-brusher can't get rid of it all. Here's where flossing comes in. Experts recommend flossing at least once a day -- using about 18 inches (45.7 centimeters) of floss wrapped around your index fingers -- to get between all your teeth and behind your very back teeth (if you're flossing correctly, it should take you about 3 to 5 minutes). If flossing is difficult, experiment with alternative such as superfloss or dental tape. Narrow, spiral interdental brushes and pronged floss holders are also effective and might be easier to use. Water picks, however, aren't a good substitute for flossing -- they don't reach into the crevices as successfully [source: Carr].