Tartar shows up as hard, rough patches on your teeth that won’t come off with brushing. Unlike the soft, sticky film of plaque that builds up throughout the day, tartar is mineralized and firmly bonded to tooth enamel. You can often spot it yourself, but some tartar hides below the gumline where only a dentist can find it.
What Tartar Looks and Feels Like
Plaque is a soft, clear or yellowish film of bacteria that you can usually wipe away with a toothbrush or your fingernail. Tartar is what happens when plaque stays on your teeth long enough to harden. It forms a crusty deposit that no amount of brushing will remove.
The easiest way to check for tartar is to run your tongue along the backs of your lower front teeth, especially near the gumline. Healthy enamel feels smooth and slick. Tartar feels rough, almost like a bumpy ridge or a grainy buildup that doesn’t belong there. If you notice a textured, uneven surface that wasn’t there before, that’s likely tartar.
Visually, tartar tends to be darker than the surrounding tooth. It can range from yellow to brown, and in heavy buildup it may even look dark green or black. You’ll most often notice discolored spots near the gumline or wedged between teeth. Over time, tartar can stain the teeth around it, making them look generally discolored even after brushing.
Where Tartar Tends to Build Up
Tartar doesn’t form evenly across your mouth. It gravitates toward areas near the openings of your salivary glands, because saliva contains the minerals that help plaque harden. The two most common spots are the backs of your lower front teeth (near the salivary glands under your tongue) and the outer surfaces of your upper molars (near the salivary glands in your cheeks). If you’re going to notice tartar anywhere first, it will probably be in one of those locations.
Tartar also forms below the gumline, where you can’t see or feel it at all. This subgingival tartar is more dangerous because it sits in direct contact with the soft tissue of your gums and can create small pockets between the teeth and gums that trap even more bacteria. You won’t know it’s there from a visual check alone.
Indirect Signs: Gums, Breath, and Sensitivity
Sometimes tartar announces itself through your gums rather than through what you see on your teeth. When tartar accumulates along or beneath the gumline, it irritates the surrounding tissue and triggers inflammation. Your gums may look red or puffy, feel tender, or bleed when you brush or floss. These are signs of gingivitis, the earliest stage of gum disease, and tartar buildup is one of the most common causes.
Persistent bad breath is another clue. Tartar’s rough, porous surface is an ideal home for bacteria. Those bacteria break down proteins from saliva, food debris, and gum tissue, producing sulfur compounds that smell unpleasant. If your breath stays stale even after brushing and flossing thoroughly, trapped tartar could be the source. The inflammation itself also contributes: as gum pockets deepen, they harbor bacteria in areas you simply can’t clean, creating a cycle of odor and tissue breakdown.
Some people also notice increased tooth sensitivity near areas of heavy buildup, particularly to hot or cold foods. This happens when tartar pushes the gumline down, exposing parts of the tooth root that aren’t protected by enamel.
Why You Can’t Remove It at Home
This is the key fact that separates tartar from plaque: once plaque mineralizes into tartar, it bonds to tooth enamel so firmly that no toothbrush, electric or manual, can break it off. Scraping at it with sharp objects at home risks damaging your enamel or cutting your gums. Tartar removal requires professional instruments, either hand scalers or ultrasonic tools that vibrate at high frequencies to crack the deposit away from the tooth surface.
For tartar that’s visible above the gumline, a standard dental cleaning is enough. For tartar trapped in pockets beneath the gumline, dentists use a deeper procedure called scaling and root planing. This involves cleaning the root surfaces below the gum and smoothing them so bacteria have a harder time reattaching. In some cases, dentists use specialized technology to find hidden deposits: miniature fiberoptic cameras that magnify the root surface up to 48 times, or devices that shine red light on the tooth and detect tartar based on its unique fluorescent signature.
How Quickly Tartar Forms
Plaque can begin hardening into tartar in as little as 24 to 72 hours if it isn’t removed. That’s why daily brushing and flossing matter so much. Once the mineralization process starts, it accelerates: existing tartar creates a rougher surface that traps more plaque, which then hardens into more tartar. People who tend to form tartar quickly (partly determined by the mineral content of their saliva) may need cleanings more often than the standard twice-a-year schedule.
Using a tartar-control toothpaste can slow new buildup by interfering with the crystallization process, though it won’t do anything about tartar that’s already formed. Brushing for two full minutes twice a day and flossing once daily remain the most effective ways to keep plaque from hardening in the first place.
What Happens If Tartar Stays
Left in place, tartar does more than look unappealing. It provides a protected surface where bacteria thrive, shielded from your toothbrush and even from antimicrobial mouthwash. The ongoing bacterial activity irritates gum tissue, and what starts as mild gingivitis can progress to periodontitis, a more serious form of gum disease where the bone supporting your teeth begins to break down. Small pockets between the teeth and gums deepen over time, creating spaces that collect more bacteria and accelerate tissue loss. Eventually, this can lead to loose teeth or tooth loss.
Heavy tartar buildup also makes cavities more likely. The bacteria living on and around tartar produce acids as they feed, and those acids erode enamel. Because tartar tends to accumulate in hard-to-clean areas, the teeth nearby are especially vulnerable.
A Quick Self-Check
- Look: Use a mirror and good lighting to examine the backs of your lower front teeth and the outer surfaces of your upper back teeth. Any yellow, brown, or dark crusty deposits near the gumline are almost certainly tartar.
- Feel: Run your tongue along the inner surfaces of your lower teeth. A rough, gritty texture that doesn’t go away after brushing signals buildup.
- Notice your gums: Redness, swelling, tenderness, or bleeding when you brush are signs that tartar may be irritating the tissue, even if you can’t see it directly.
- Check your breath: Chronic bad breath that persists despite good brushing habits can point to bacterial colonies living on hidden tartar.
If any of these signs are familiar, a dental cleaning is the only way to remove what’s already there and get a clear picture of whether tartar has formed below the gumline where you can’t detect it on your own.