Tartar is hardened dental plaque that has calcified on your teeth, forming a rough, crusty deposit that you can’t remove with brushing or flossing alone. It develops when the soft, sticky film of bacteria on your teeth (plaque) absorbs minerals from your saliva and solidifies, sometimes in as little as 24 to 72 hours. Once formed, tartar creates a sheltered environment where more bacteria accumulate, raising your risk of cavities, gum disease, and eventually bone and tooth loss.
How Plaque Becomes Tartar
Your mouth naturally contains hundreds of species of bacteria. These bacteria mix with food particles and proteins in your saliva to form plaque, a colorless, sticky film that coats your teeth throughout the day. When plaque sits undisturbed, minerals in your saliva, primarily calcium and phosphate, begin depositing into the bacterial film. These minerals crystallize into rigid structures, transforming the soft plaque into a hardite deposit cemented to your tooth surface.
The mineral crystals in tartar are primarily forms of calcium phosphate, including the same compound found in tooth enamel (hydroxyapatite) along with other crystalline structures containing magnesium and phosphate. This mineral content is what makes tartar so hard and impossible to brush away. It essentially becomes part of the tooth’s surface, bonded tightly to the enamel or root.
How to Spot Tartar on Your Teeth
Tartar typically appears as yellowish or brownish deposits along the gumline, though in severe cases it can darken to a deep brown. The texture is rough and chalky. If you run your tongue along your teeth and feel gritty, rock-like patches that resist your toothbrush, that’s likely tartar.
Certain areas of your mouth are more prone to buildup. The back side of your lower front teeth and the outer surfaces of your upper molars are the most common spots, because salivary glands located nearby release a steady supply of the minerals that drive calcification. You may first notice tartar in these areas as a stubborn ridge that feels different from the smooth enamel around it.
Two Types Based on Location
Tartar that forms above the gumline is called supragingival calculus. It’s the kind you can see: white or yellowish, hard and clay-like, and relatively easy for a dental professional to remove. While it contributes to gum irritation and decay, it’s generally the less dangerous type.
Tartar that forms below the gumline, called subgingival calculus, is a bigger concern. It’s brown or greenish-black, extremely firm (sometimes described as flint-like), and invisible during a normal visual exam. It attaches tightly to the root surface and is much harder to remove. Research in periodontal health has identified the presence of subgingival calculus as the single best predictor of future attachment loss, meaning the breakdown of the tissue and bone anchoring your teeth in place.
Why Tartar Is Harmful
Tartar itself isn’t the direct cause of gum disease, but it plays a critical supporting role. Its rough, porous surface is always covered by a fresh layer of living bacterial plaque. Because tartar can’t be removed at home, that bacterial layer stays put, constantly releasing toxins against your gum tissue. Tartar also physically irritates the gums, pushes pocket walls apart, and blocks your immune cells from reaching infected areas effectively.
Over time, bacteria sheltered by tartar migrate deeper below the gumline. They wear away the tissues that support your teeth, triggering an inflammatory response called periodontitis. Your body’s immune reaction, combined with bacterial toxins, gradually destroys the bone surrounding your tooth roots. Studies examining tartar-coated root surfaces have found significant stimulation of bone breakdown, providing strong evidence that subgingival tartar is directly involved in the destructive process. Left untreated, this cycle leads to gum recession, loose teeth, and tooth loss.
How Dentists Remove It
Professional cleaning is the only safe, effective way to remove tartar. The process is called scaling, and for buildup below the gumline, it’s paired with root planing, which smooths the root surface so gums can reattach.
For visible tartar above the gumline, dental hygienists typically use hand instruments with sharp, flat blades designed to lift deposits off the enamel. Ultrasonic scalers are also common. These vibrate at high frequency to break tartar apart while a water spray flushes the debris away. Most people experience mild pressure and occasional sensitivity during the process, but it’s generally well tolerated.
Subgingival tartar requires more specialized technique. Hygienists use spoon-shaped instruments called curettes that can slide beneath the gumline and follow the curved contour of the root without cutting the surrounding tissue. For deep pockets (5 millimeters or more), longer and narrower instrument variations allow access to tight spaces, including the fork-like areas where roots divide. In some cases, a tiny dental endoscope can be threaded below the gumline to give the clinician a direct view of hidden deposits, improving the thoroughness of removal.
After a deep cleaning, you can expect some gum tenderness and sensitivity for a few days. Your dentist may schedule a follow-up visit to check whether the gums are healing and reattaching to the tooth surface.
Why You Shouldn’t Remove Tartar at Home
Dental scalers are available for purchase online, but using them without training carries real risks. You can damage your gum tissue, causing pain and recession that exposes sensitive root surfaces permanently. You can injure your cheeks, tongue, or other soft tissue. Perhaps most concerning, you can accidentally push tartar fragments beneath the gumline, creating the conditions for a gum abscess or deeper infection. Professional instruments require specific angles and pressure to work safely, and even dental students spend considerable time learning proper technique.
Preventing Tartar From Forming
Since tartar is just mineralized plaque, preventing it comes down to removing plaque before it has a chance to harden. Brushing twice a day and flossing daily are the foundation, with extra attention to the areas behind your lower front teeth and along the outer molars where buildup concentrates.
Tartar-control toothpastes offer an additional layer of prevention. The active ingredients in most of these products are pyrophosphates (tetrasodium pyrophosphate or disodium pyrophosphate), which work by blocking calcium phosphate crystals from forming in the first place. They disrupt the crystallization process that turns soft plaque into hard tartar. Some formulations also include zinc, which elevates zinc levels in your saliva for several hours after brushing and independently inhibits crystal growth. Manufacturers often combine pyrophosphates with a specific polymer that protects them from being broken down by enzymes in your mouth, extending their effectiveness between brushings.
These products can slow new tartar formation, but they won’t dissolve tartar that already exists. Regular dental cleanings, typically every six months, remain the only way to reset the clock and remove what home care can’t reach.