Black tartar is hardened dental plaque that has darkened over time from exposure to blood, tobacco, or deeply pigmented foods and drinks. It starts as a soft, sticky film of bacteria on your teeth, then mineralizes into a rock-hard deposit that no amount of brushing can remove. While all tartar is a problem for your oral health, black tartar signals that the buildup has been there for a while or has formed below the gum line, where it does the most damage.
How Tartar Forms and Turns Black
Every time you eat, bacteria in your mouth feed on sugars and starches, producing a soft film called plaque. If that plaque isn’t brushed away, it begins absorbing minerals from your saliva (primarily calcium phosphate, calcium carbonate, and magnesium phosphate) and hardens into calculus, the clinical term for tartar. This process can begin in as little as four to eight hours, which is why skipping even one brushing session matters.
Fresh tartar is usually yellowish or off-white. It turns darker the longer it stays on your teeth. Black coloring comes from a few specific sources. Tobacco stains tartar quickly and deeply. Heavy consumption of tea, coffee, or red wine does the same. But the most common reason tartar turns truly black is contact with blood. When tartar forms below the gum line, it sits in constant contact with tiny amounts of bleeding from inflamed gum tissue. The iron and other compounds in blood stain the deposit dark brown to black over time.
Where Black Tartar Shows Up
There are two types of tartar, and location matters. Supragingival tartar sits above the gum line, where you can see it. It tends to collect behind the lower front teeth and on the outer surfaces of upper molars, near the openings of your salivary glands. This type is easier to spot and easier to remove. It often looks yellow or brown, though it can darken with staining.
Subgingival tartar forms below the gum line, in the small pocket between your tooth and gum tissue. This is the type most likely to be black because of its contact with blood from irritated gums. You often can’t see it yourself. It may only become visible as a dark shadow along the gum line, or your dentist may detect it during a routine exam with a small probe. Subgingival tartar is the more dangerous of the two because it sits right against the tooth root and the soft tissue that holds your teeth in place.
Black Tartar vs. Cavities vs. Stains
A dark spot on your tooth isn’t always tartar. Here’s how to tell the difference:
- Black tartar feels rough or grainy when you run your tongue over it. It usually sits along or just below the gum line, and your gums may look puffy or bleed when you floss nearby. It builds up and darkens gradually over weeks to months.
- Surface stains from food or tobacco are smooth and hard. They often appear on the front or back of teeth and in the grooves of molars. Whitening toothpaste may lighten them slightly, but they won’t fully disappear without professional cleaning. They cause no pain.
- Cavities can also look like dark spots, but the center of the spot tends to feel sticky or soft rather than rough. The surrounding enamel may appear chalky white or dull. Sensitivity to sweets or cold is an early clue. If dental floss catches on the spot and you notice it slowly getting larger, treat it as decay until a dentist confirms otherwise.
- Old metal fillings can darken teeth from the inside. They feel hard and smooth, the dark color stays stable for years, and they don’t cause pain unless the filling is cracked or leaking.
What Black Tartar Does to Your Mouth
Tartar isn’t just a cosmetic problem. It creates a rough, porous surface that gives bacteria an ideal place to multiply, far more effectively than smooth enamel does. The longer it stays, the more damage it causes.
In the early stage, the bacteria and inflammation lead to gingivitis: red, swollen gums that bleed easily. Left untreated, this progresses to periodontitis, a more serious infection of the structures that support your teeth. Black tartar below the gum line is particularly destructive here. It drives chronic inflammation that causes gums to pull away from teeth, creating deeper pockets where even more bacteria collect. Over time, this leads to receding gums, gaps forming between teeth, persistent bad breath, weakened enamel, and in advanced cases, tooth loss. The relationship between black tartar and severe gum disease is straightforward: the darker and more deeply lodged the tartar, the longer it’s been causing damage.
How Dentists Remove It
There is no way to remove tartar at home. Once plaque has mineralized, it bonds to your tooth surface so firmly that a toothbrush, floss, or any over-the-counter tool cannot dislodge it. Attempting to scrape it off yourself risks damaging your enamel and gum tissue.
For tartar above the gum line, a standard professional cleaning is usually enough. Your dental hygienist uses hand scalers or ultrasonic instruments that vibrate at high frequency to break the calculus away from the tooth surface.
Black tartar below the gum line requires a deeper procedure called scaling and root planing. During scaling, the hygienist or dentist works beneath the gum line to remove all tartar and bacterial deposits from the tooth roots. Root planing then smooths the root surfaces, which helps gums reattach to the tooth and makes it harder for new tartar to form. The procedure is typically done with local anesthesia so you stay comfortable. Depending on how much buildup there is, your dentist may treat your mouth in sections over two or more visits. Some tenderness and sensitivity afterward is normal and usually resolves within a few days.
Preventing Black Tartar From Forming
Since tartar is mineralized plaque, prevention comes down to removing plaque before it hardens. Brush twice a day for two full minutes, and floss daily to clear plaque from between teeth and along the gum line, the exact spots where tartar loves to build up.
Tartar-control toothpastes offer a real advantage. These products contain ingredients like pyrophosphates or zinc compounds that interfere with the crystallization process that turns plaque into calculus. Studies show tartar-control products can reduce new calculus formation by up to 29% compared to regular brushing alone. They won’t remove existing tartar, but they slow new deposits significantly.
Cutting back on sugary foods and drinks (including starchy carbohydrates like white bread and pasta) reduces the fuel supply for plaque-forming bacteria. If you smoke or use tobacco, that’s one of the strongest risk factors for both rapid tartar buildup and the dark staining that makes it black. Quitting makes a measurable difference in how fast tartar accumulates and how your gums heal after treatment.
Professional cleanings every six months catch tartar buildup before it progresses to the subgingival, tissue-damaging stage. If you’re prone to heavy tartar formation, your dentist may recommend cleanings every three to four months instead.