Plaque between your teeth forms constantly and can only be removed mechanically, meaning you need a physical tool to disrupt it. A toothbrush, no matter how well you use it, cannot reach the tight contact points and surfaces where two teeth meet. That’s why daily interdental cleaning is a separate, non-negotiable step in keeping your teeth and gums healthy.
Why Plaque Between Teeth Is Different
The bacterial communities living between your teeth aren’t the same as those on the flat, exposed surfaces of your molars. The spaces between teeth and along the gumline tend to harbor more anaerobic species, bacteria that thrive without oxygen, feeding on proteins in gum fluid rather than sugars. These organisms can directly damage gum tissue and, more critically, break down proteins that normally keep your body’s inflammatory response in check. Left undisturbed, this biofilm hardens into tarite (calculus) that no home tool can remove.
On the other hand, bacteria involved in cavities between teeth, like certain streptococci and lactobacilli, rapidly convert dietary sugars into acid. That acid eats into enamel at the contact point between teeth, one of the most common places for cavities to develop and one of the hardest for dentists to detect early. Removing plaque daily interrupts both of these processes before they cause lasting damage.
String Floss: The Classic Option
Traditional floss works well for tight contacts where teeth sit snugly together. The technique matters more than the brand. Break off about 18 inches, wind most of it around one middle finger, and use your thumbs and index fingers to guide a short section between each pair of teeth. When the floss reaches the gumline, curve it into a C shape against one tooth and gently slide it just below the gum margin. Then rub the side of that tooth with an up-and-down motion, following the natural contour. Repeat against the adjacent tooth before moving on.
The most common mistake is snapping the floss straight down into the gum tissue. This causes pain, bleeding, and discourages people from continuing. A gentle sawing motion to pass through the contact point, followed by the C-shape hug against each tooth surface, removes plaque without trauma. If your gums bleed when you first start flossing regularly, that’s a sign of existing inflammation, not damage from the floss itself. Bleeding typically clears up within about a week of consistent daily use.
Interdental Brushes: More Effective for Most People
If you have any gaps between your teeth, even small ones, interdental brushes are worth trying. These are tiny bottle-brush-shaped picks that slide between teeth to scrub both surfaces at once. A systematic review in the Canadian Journal of Dental Hygiene found that interdental brushes produced statistically significant reductions in both plaque scores and gum bleeding compared to string floss across multiple clinical trials.
The reason is simple: an interdental brush conforms to the shape of the space and contacts more surface area than a thin strand of floss. They come in various sizes, from very fine wire brushes for narrow gaps to wider ones for larger spaces. You may need two or three different sizes to fit all the gaps in your mouth. The brush should slide in with gentle pressure without forcing. If it doesn’t fit, the space is too tight and floss is the better choice for that spot. No toothpaste is needed; just insert the brush and move it back and forth a few times.
Water Flossers: A Good Complement
Water flossers use a pressurized stream of water to flush debris and bacteria from between teeth and below the gumline. A six-week clinical trial found that people using a water flosser with a manual toothbrush showed improvements in gum attachment levels and pocket depth that exceeded those seen in people who brushed and flossed with string. The water flosser group also outperformed people who only brushed.
Water flossers are particularly useful if you have braces, dental implants, bridges, or other hardware that makes threading floss difficult. They’re also a good option for people with dexterity issues. That said, a water flosser works best as a supplement to, not a replacement for, a tool that physically scrubs the tooth surface. The pressurized water excels at flushing loose bacteria and food particles, but an interdental brush or floss provides more direct mechanical disruption of the sticky biofilm itself.
Choosing the Right Tool for Your Mouth
- Tight contacts with no visible gaps: String floss or a thin interdental brush (if it fits without forcing).
- Visible gaps between teeth: Interdental brushes in the appropriate size. They’re faster and more effective here than floss.
- Braces, bridges, or implants: A water flosser for general flushing, plus floss threaders or specialized orthodontic brushes for direct cleaning.
- Receding gums or periodontal pockets: Interdental brushes are especially useful because they can reach slightly below the gumline where pockets form.
Many people benefit from using more than one tool. You might floss your front teeth, use interdental brushes for the wider spaces between your back teeth, and finish with a water flosser. The ADA’s recommendation is straightforward: clean between your teeth once daily, using whatever tool you’ll actually use consistently.
When Home Cleaning Isn’t Enough
Once plaque mineralizes into tartar, no amount of flossing or brushing will remove it. Tartar can form above and below the gumline, and it provides a rough surface where new plaque accumulates even faster. Professional cleaning uses either ultrasonic instruments, which vibrate at high frequency to break tartar apart, or manual scaling tools shaped to reach into the complex anatomy around each tooth and below the gums. Some dental offices also use fine powder sprays of glycine or erythritol to remove biofilm from deeper pockets, particularly the bacterial species most associated with gum disease.
If you’ve been inconsistent with interdental cleaning and notice persistent bleeding, bad breath, or gums that look puffy or dark red, a professional cleaning resets the baseline. From there, daily home care can maintain healthy tissue. Most people need professional cleanings every six months, though those with active gum disease may need them more frequently until inflammation is under control.
Building the Habit
The single biggest factor in removing plaque between teeth is doing it every day. Bacterial biofilm starts reorganizing within hours of being disrupted, and it becomes more complex and harder to remove the longer it sits. Cleaning once a day, ideally before bed so bacteria don’t have an undisturbed eight-hour window, keeps the community from maturing to the point where it causes problems.
If you’ve never been consistent, expect a rough first week. Your gums will likely bleed and feel tender. This is inflammation that was already there, now becoming visible because you’re disturbing the bacterial colonies causing it. Push through that week. Once daily cleaning becomes routine, the bleeding stops, the gums tighten around your teeth, and the whole process takes less than two minutes.