Tartar is a hard, rough, crusty deposit on your teeth that ranges from yellowish-white to dark brown depending on where it forms and what you eat or drink. Unlike the soft, invisible film of plaque that builds up daily, tartar is calcified and clearly visible. You can often feel it with your tongue as a rough, bumpy ridge along the gumline.
Tartar Above the Gumline
The tartar you can actually see in the mirror forms above the gumline, and dentists call it supragingival calculus. It typically appears as a white-gray or yellowish mass that clings to the tooth surface, especially along the edges where your teeth meet your gums. In its early stages, it may look like a pale, chalky buildup that blends in with your tooth color. As it thickens, it becomes more obvious: a raised, uneven crust that no amount of brushing will remove.
The most common spots to find it are the inside surfaces of your lower front teeth and the outer surfaces of your upper back molars. These areas sit closest to the openings of your salivary glands, which means they’re constantly bathed in mineral-rich saliva. That mineral content is exactly what turns soft plaque into rock-hard tartar, sometimes in as little as 24 to 72 hours.
Tartar Below the Gumline
Tartar also forms in places you can’t see. Subgingival calculus develops on the root surface beneath your gums, tucked inside the small pocket between the tooth and gum tissue. This type looks dramatically different from the pale buildup above. It’s typically dark brown, black, or dark green, picking up its color from blood pigments in inflamed, diseased gum tissue.
Because it’s hidden, subgingival tartar often goes unnoticed until a dentist probes beneath the gumline or takes X-rays. It has a dense, flint-like consistency and attaches firmly to the root surface, making it harder to remove than the variety above the gumline. If you notice your gums bleeding, looking swollen, or pulling away from your teeth, dark-colored tartar below the surface is a common culprit.
How Color Changes Over Time
Fresh tartar starts out relatively light, usually white or pale yellow. Over weeks and months, it absorbs pigments from everything passing through your mouth. Coffee and tea contain tannins, a type of plant compound that causes color to cling to surfaces, and they can turn tartar a deep yellow or brown. Tobacco is especially effective at darkening it: nicotine turns yellowish when it reacts with oxygen, while tar is naturally dark. Smokers and heavy coffee drinkers often develop tartar that looks noticeably darker than what you’d see on someone who avoids both.
Red wine, dark berries, and certain spices can also contribute to staining. The rougher tartar’s surface becomes, the more easily it traps these pigments, creating a cycle where buildup attracts more discoloration over time.
How to Tell Tartar From Plaque
Plaque and tartar are related but look and feel completely different. Plaque is the starting material: a soft, sticky, nearly invisible film that coats your teeth throughout the day. It’s colorless or pale yellow, and you usually can’t see it unless it builds up significantly. You can remove plaque with a toothbrush and floss.
Tartar is what plaque becomes when it isn’t removed in time. Minerals in your saliva harden the plaque into a calcified deposit that bonds to your tooth. At that point, it’s rough to the touch, clearly visible as a yellow, brown, or gray crust, and impossible to brush off at home. Running your tongue along the inside of your lower front teeth is the easiest self-check. Smooth enamel means you’re in good shape. A bumpy, gritty ridge near the gumline is tartar.
Where It Shows Up First
Tartar doesn’t form evenly across every tooth. It clusters in predictable spots tied to saliva flow and brushing habits. The inside of your lower front teeth is the single most common location, and many people first notice tartar there as a yellowish band running horizontally behind those teeth. The outer surfaces of your upper molars, near your cheeks, are the second most common site.
You’re also more likely to see buildup in areas that are hard to reach with a toothbrush: the tight spaces between teeth, along crooked or crowded teeth, and around dental work like bridges or braces. If you wear a retainer or have bonded wires behind your teeth, check those areas closely.
What Happens If It Stays
Tartar isn’t just a cosmetic problem. Its rough, porous surface creates an ideal environment for bacteria to colonize, which accelerates gum inflammation. Left in place, tartar above the gumline contributes to gingivitis: red, swollen gums that bleed when you brush. Below the gumline, it drives the progression toward periodontitis, where the bone supporting your teeth begins to break down.
The only way to remove tartar once it has formed is with professional dental instruments. Scaling, the scraping you feel during a cleaning, physically detaches the calcified deposit from the tooth surface. For tartar below the gumline, a deeper cleaning called root planing smooths the root surface so the gum can reattach. How often you need these cleanings depends on how quickly you build up tartar, but every six months is standard for most people, and every three to four months for those prone to heavy accumulation.
Consistent brushing twice a day and daily flossing are the most effective ways to keep plaque from hardening in the first place. Tartar-control toothpastes contain ingredients that slow mineralization, buying you extra time between cleanings, though they won’t remove tartar that has already formed.