The most effective way to get rid of plaque between teeth is to physically disrupt it every day with floss, interdental brushes, or a water flosser. Plaque is a soft, sticky film of bacteria that constantly reforms on tooth surfaces, especially in the tight spaces between teeth where your toothbrush can’t reach. Left undisturbed, it can harden into tartar in as little as four to eight hours, though full mineralization typically takes 10 to 12 days. Once it hardens, you can’t remove it at home. The goal is to break up that soft biofilm before it calcifies.
Why Plaque Builds Up Between Teeth
Your toothbrush handles the front, back, and chewing surfaces of your teeth reasonably well. But bristles simply don’t fit into the narrow contact points where two teeth press together. These interproximal spaces are warm, sheltered, and constantly bathed in saliva and food particles, making them ideal for bacterial colonies. Plaque starts forming within minutes of eating, and the bacteria in it feed on sugars and starches to produce acids that erode enamel and irritate gum tissue.
Because these gaps are hidden from view and hard to feel with your tongue, plaque can accumulate for days without you noticing. By the time you feel a rough or fuzzy texture between teeth, or notice bleeding when you floss, the biofilm is well established. Consistent daily disruption is the only way to keep it from gaining a foothold.
String Floss: The C-Shape Technique
Standard dental floss remains one of the most accessible tools for cleaning between teeth, but technique matters more than most people realize. Simply snapping floss up and down between teeth misses the curved surfaces where plaque clings and can injure your gums in the process.
The proper approach, recommended by dental professionals at UT Health San Antonio, works like this: cut a forearm-length piece of floss and wrap the ends around each middle finger, leaving your index fingers and thumbs free to guide it. Starting at the back of your upper or lower jaw, gently slide the floss between two teeth. Once it’s through the contact point, curve it into a C-shape against one tooth and move it back and forth while sliding it below the gumline as far as it will comfortably go. Before pulling the floss out, repeat the same C-shape motion against the adjacent tooth. This ensures you’re scrubbing both surfaces in each gap, not just popping floss in and out.
The below-the-gumline step is critical. Plaque doesn’t stop at the visible tooth surface. It extends into the shallow pocket where your gum meets the tooth, and that’s exactly where early gum disease begins.
Interdental Brushes
If you have gaps between your teeth that are wide enough, small interdental brushes (sometimes called proxy brushes or interproximal brushes) can be even more effective than floss. These tiny bottle-brush-shaped tools slide between teeth and physically sweep plaque off both surfaces at once. They come in a range of sizes, from very fine wire for tight spaces to wider brushes for larger gaps or around dental work like bridges.
The key is choosing the right size. The brush should fit snugly without forcing. If you have to jam it through, you need a smaller size or floss is a better option for that particular space. Many people have a mix of tight and wide gaps, so using more than one size is common.
Water Flossers
Water flossers use a pressurized stream of water to flush bacteria and debris from between teeth and along the gumline. A systematic review found that the majority of clinical studies favored water flossers over traditional dental floss for plaque reduction. They were especially effective at reaching inaccessible interproximal areas compared to string floss.
Water flossers are a strong option if you have braces, dental implants, bridges, or other prosthetics that make string floss difficult to maneuver. They’re also useful if you have limited hand dexterity from arthritis or other conditions that make wrapping and guiding floss uncomfortable. The trade-off is cost (a quality unit runs $40 to $80) and the need for a power source and water reservoir, which makes them less portable than a spool of floss.
Mouthwash as a Supplement
An antiseptic mouthwash can help, but it’s a supplement to mechanical cleaning, not a replacement. Rinses containing essential oils (the active ingredients in products like Listerine) have been shown to penetrate dental biofilm and disrupt bacterial colonies. Chlorhexidine-based rinses are even more potent against plaque bacteria, though they’re typically used short-term because they can stain teeth with prolonged use.
Swishing mouthwash reaches some interproximal surfaces, but it can’t physically dislodge a mature plaque layer the way floss or a brush can. Think of it as a finishing step: after you’ve mechanically broken up the biofilm, an antiseptic rinse helps kill remaining bacteria and slows regrowth.
How to Tell If Plaque Has Hardened Into Tartar
Soft plaque is invisible or barely visible, usually white or pale yellow, and it wipes away easily with floss or a brush. Tartar is a different story. Once plaque mineralizes, it becomes a hard, crusty deposit that bonds to the tooth surface. You might feel it as a rough, gritty texture when you run your tongue along your teeth, sometimes described as the sensation of teeth “wearing sweaters.”
Visually, tartar appears as yellow or brown discoloration, most commonly along the gumline or between the lower front teeth (where saliva glands deposit minerals that speed calcification). Tartar also absorbs stains from coffee, tea, red wine, and berries, which deepens its color over time. If you see or feel these signs, no amount of flossing will remove the deposit. Tartar requires professional scaling with specialized dental instruments.
Building a Routine That Works
The best interproximal cleaning method is the one you’ll actually do every day. Plaque reforms continuously, and the window before it starts hardening can be as short as four to eight hours. That’s why once-daily interdental cleaning is the minimum, and twice daily is better if you’re prone to buildup or gum disease.
A few practical tips to make the habit stick:
- Clean between teeth before brushing. This loosens plaque and debris so your toothpaste’s fluoride can reach those freshly cleaned surfaces.
- Go systematically. Start at the same spot every time (back left, for example) and work your way around. Random flossing tends to skip teeth.
- Don’t avoid spots that bleed. Bleeding when you floss usually signals inflamed gums from plaque accumulation. Consistent gentle cleaning resolves this for most people within one to two weeks.
- Use a disclosing tablet occasionally. These chewable tablets stain remaining plaque pink or purple, showing you exactly where you’re missing. They’re inexpensive, available at most pharmacies, and surprisingly revealing.
If you’ve been neglecting the spaces between your teeth for a while, a professional cleaning is the best starting point. Your dentist or hygienist can remove any existing tartar, giving you a clean baseline. From there, daily mechanical disruption of plaque keeps new buildup from taking hold.