Soft plaque on the back of your teeth comes off with the right brushing technique, but if it has hardened into tartar, only a dental professional can safely remove it. The back surfaces of your teeth, especially your lower front teeth, are the most common spot for buildup because saliva glands sit right underneath them, constantly bathing those surfaces in mineral-rich saliva that speeds up hardening.
The first step is figuring out what you’re dealing with. Run your tongue along the back of your lower front teeth. If it feels fuzzy or slightly sticky, that’s soft plaque, and you can remove it at home. If it feels like a rough, hard ledge that won’t budge when you brush, that’s tartar, and no amount of scrubbing will get it off safely.
Why the Back of Your Teeth Collects So Much Buildup
Your sublingual glands sit below either side of your tongue, under the floor of your mouth, and your submandibular glands sit just below your jaw. Both constantly release saliva directly onto the tongue-facing surfaces of your lower front teeth. Saliva contains calcium phosphate, which is normally a good thing: it helps remineralize enamel. But when plaque sits on a tooth surface and gets bathed in those minerals, it hardens into tartar in as little as 24 to 72 hours.
Most people brush the front-facing surfaces of their teeth thoroughly but rush through (or skip entirely) the back sides. That combination of heavy mineral exposure and less brushing time makes the back of the lower front teeth the number-one spot for tartar to form.
How to Brush the Back of Your Teeth Properly
For the back surfaces of your front teeth, both top and bottom, turn your toothbrush vertically so it fits behind the teeth. Use the toe (the tip) of the brush head and make small up-and-down strokes, angling the bristles toward the gum line. This is the area most people miss because a horizontal brush position simply doesn’t fit well there.
For the back surfaces of your molars and premolars, keep the brush horizontal but tilt it at roughly a 45-degree angle toward the gums. Use small back-and-forth movements or tiny circles rather than long sweeping strokes. The goal is to disrupt plaque right where the tooth meets the gum, since that junction is where buildup causes the most damage.
Spend at least two full minutes brushing overall, and consciously give extra time to those inner surfaces. A common trick: start your brushing routine on the back of the lower front teeth while you still have the patience to be thorough, then move to the easier outer surfaces.
Electric Toothbrushes Make a Real Difference
If you struggle to keep these surfaces clean with a manual brush, switching to an electric toothbrush is one of the most effective changes you can make. Over periods longer than three months, electric toothbrushes achieve about 21% greater plaque reduction and 11% greater reduction in gum inflammation compared to manual brushes. Sonic-style brushes perform especially well in hard-to-reach areas like the back of teeth and the spaces between molars.
The smaller, round heads on many electric brushes also fit more easily behind the lower front teeth, solving the access problem that makes manual brushing there so awkward.
Cleaning Between Teeth Matters Too
Plaque doesn’t just sit on flat surfaces. It builds up between teeth where brush bristles can’t reach, and that buildup wraps around to the back side. Flossing handles this, but interdental brushes (the tiny bottle-brush-shaped picks) may work even better if you have enough space between your teeth to fit them. Studies consistently show interdental brushes produce greater plaque removal and larger improvements in gum health compared to floss, particularly over periods of six weeks or longer. If your teeth are tightly spaced, traditional floss or thin ribbon floss is the better choice.
Tartar Control Toothpaste Slows Hardening
Once plaque mineralizes into tartar, toothpaste can’t dissolve it. But tartar-control toothpastes contain ingredients that slow the crystallization process, giving you more time to brush plaque away before it hardens. The active agents to look for include zinc citrate, pyrophosphates, and sodium hexametaphosphate. Clinical trials show formulas with sodium hexametaphosphate reduce tartar formation by up to 55% compared to regular toothpaste.
A small number of people experience sensitivity to sodium hexametaphosphate. If you notice irritation after switching to a tartar-control paste, try one that uses zinc citrate or pyrophosphates instead. These toothpastes won’t remove existing tartar, but they’re genuinely useful for preventing new buildup on those vulnerable back surfaces between dental cleanings.
Why You Shouldn’t Scrape Tartar Off Yourself
Metal dental scrapers are widely sold online, and it’s tempting to try to chip off that hard ridge behind your lower teeth at home. This is a bad idea for several specific reasons. You can scratch your enamel, which causes permanent tooth sensitivity. You can cut or tear your gum tissue, leading to recession that exposes the roots of your teeth. You can accidentally push tartar underneath the gum line, which can cause abscesses and deeper infections. And without proper training, you’re likely to injure your cheeks, tongue, or the floor of your mouth.
Dental hygienists use specialized ultrasonic instruments and hand scalers with precise technique, and they can see what they’re doing with proper lighting and mirrors. The back surfaces of your lower teeth are one of the hardest areas in your mouth to access on your own, making the risk of injury even higher.
What Happens If You Leave It
Plaque and tartar along the gum line on the back of your teeth cause the same damage they cause anywhere else: gum disease. The early stage, gingivitis, often starts without obvious symptoms. As it progresses, you may notice gums that bleed easily when brushing, persistent bad breath that doesn’t go away after brushing, redness and swelling along the gum line, sensitivity to hot or cold foods, and tenderness when chewing.
Because the back surfaces of your teeth aren’t visible when you smile, gum disease in this area can progress significantly before you notice it. Left untreated, gingivitis advances to periodontitis, which involves the gums pulling away from teeth and eventual bone loss in the jaw. This is why regular professional cleanings matter even if your teeth look fine from the outside.
How Often to Get Professional Cleanings
There’s no universal magic number. The American Dental Association recommends that cleaning frequency be tailored to your individual risk of disease rather than following a rigid schedule. For most people, that means every six months. If you’re prone to heavy tartar buildup on the back of your lower teeth (and you’ll know because your hygienist mentions it at every visit), you may benefit from cleanings every three to four months. Your dentist can assess your rate of buildup and recommend a schedule that actually keeps tartar under control between visits.