Understanding the Difference Between Plaque and Tartar

Plaque is a soft, sticky film of bacteria that forms on your teeth every day and can be removed with brushing and cleaning between the teeth. Tartar, also called calculus, is what plaque becomes when it is left in place and hardens with minerals from your saliva. Once plaque turns into tartar it bonds firmly to the tooth and can only be removed by a dental professional with special instruments.

What exactly is dental plaque?

Plaque is a biofilm, which means it is a community of bacteria living together in a sticky matrix they produce themselves. It starts forming within hours of cleaning your teeth, as bacteria in the mouth attach to the thin protein layer that coats enamel. Over time the film thickens and the mix of bacteria within it changes, becoming more likely to cause harm.

You cannot usually see thin plaque, but you can often feel it as a slightly fuzzy coating on your teeth, particularly before brushing in the morning. When it builds up more heavily it can look like a pale yellow or greyish layer near the gumline. Because it is soft, plaque is removed easily by a toothbrush and by cleaning between the teeth, provided you reach every surface.

How does plaque turn into tartar?

Saliva is rich in minerals such as calcium and phosphate, which are normally helpful because they repair early enamel damage. However, when plaque is left undisturbed, those same minerals are deposited into the biofilm and it begins to calcify. In effect, the soft film sets like cement onto the tooth surface.

This process can begin surprisingly quickly, within a day or two in areas that are missed regularly. It tends to happen fastest on the tooth surfaces closest to salivary gland openings, which is why tartar often builds up on the inside of the lower front teeth and the outer surfaces of the upper back teeth. Once formed, tartar has a rough surface that makes it even easier for new plaque to accumulate on top.

How can you tell plaque and tartar apart?

Plaque is soft, colourless to pale yellow, and shifts when you run a nail or a brush over it. It reforms quickly after cleaning. If you use disclosing tablets, which stain plaque temporarily, you can see exactly where it is sitting and which spots your routine is missing.

Tartar is hard and does not move when you brush. It is often darker, ranging from yellow to brown, especially in people who smoke or drink a lot of tea, coffee or red wine. It can feel rough or crusty to the tongue and is most noticeable around the gumline and between teeth. Tartar below the gumline is usually darker still and can only be seen by a dentist.

Why are plaque and tartar bad for your teeth?

The bacteria in plaque feed on sugars from your food and drink and produce acid as a by-product. That acid dissolves minerals from enamel, and repeated attacks over time create the cavities we call tooth decay. The longer plaque sits on a tooth, the more damage it does, which is why the gaps and grooves it hides in are common sites for decay.

Plaque along and under the gumline also triggers the body’s inflammatory response, leading to gum disease. Early on this shows as red, puffy gums that bleed easily. If tartar builds up, it holds plaque against the gum permanently and the inflammation continues, potentially progressing to damage of the bone that supports the teeth. Tartar itself is not alive, but it is a constant reservoir for the bacteria that cause the problems.

Can you remove tartar at home?

No, not safely. Tartar is firmly bonded to the tooth and removing it requires specific instruments and training. Attempting to scrape it off yourself with metal picks or sharp tools risks scratching the enamel, damaging the gums and pushing debris under the gumline, which can make matters worse and introduce infection.

What you can do at home is prevent new tartar from forming and stop existing tartar from growing. Thorough daily plaque removal is the key, because tartar cannot form where plaque is not left in place. So-called tartar-control toothpastes can slow the hardening process slightly, but they do not dissolve tartar that has already formed. Professional removal remains the only reliable option.

How do dentists remove tartar?

A dentist or hygienist removes tartar through a procedure called scaling. This may use hand instruments with fine tips designed to lift tartar off the tooth, ultrasonic scalers that use rapid vibration and a water spray to break it away, or a combination of both. The aim is to leave the tooth and root surfaces clean and smooth so plaque is less able to cling to them.

If tartar has built up below the gumline and gum disease is present, a deeper clean of the root surfaces may be needed, sometimes with the area numbed for comfort. After the tartar is removed, gums that were inflamed usually begin to heal within days. Your dental team will also show you which areas to focus on so the tartar does not simply return before your next visit.

How often should you have a professional clean?

The right interval varies from person to person. Someone with excellent home care and a low tendency to form tartar may only need a clean once a year, while someone who builds tartar quickly or has gum disease may benefit from visits every three to four months. Your dentist will recommend a schedule based on how your mouth actually responds.

Sticking to that schedule matters because tartar removal is not a one-off fix. Plaque starts reforming immediately, and in tartar-prone people a fresh layer can harden within weeks. Regular cleans keep the total amount low, protect the gums and give your dental team a chance to spot early decay or gum changes before they become serious.

What is the best way to prevent tartar build-up?

Brush twice a day for two minutes with a fluoride toothpaste, angling the bristles towards the gumline where plaque collects. Clean between your teeth once a day with floss or interdental brushes to reach the surfaces a brush cannot. Pay particular attention to the inside of the lower front teeth and the back teeth, where tartar forms fastest.

Supporting habits help too. Drinking water after meals rinses away food debris, limiting sugary and starchy snacks reduces the fuel available to plaque bacteria, and not smoking lowers both tartar staining and gum disease risk. Combine consistent home care with professional cleans at the interval your dentist advises, and tartar becomes a minor, manageable issue rather than a recurring problem.

Do plaque and tartar affect your breath and appearance?

Yes, both can. The bacteria in plaque release sulphur compounds as they break down food debris and cells, and these are a major cause of everyday bad breath. When plaque is allowed to mature and tartar builds up along the gumline, the bacterial load rises and breath odour often becomes more persistent, no matter how often you use mouthwash. Treating the underlying build-up is far more effective than masking it.

Appearance is affected too. Tartar is porous and readily absorbs colour from tea, coffee, red wine and tobacco, so it often shows as yellow or brown deposits, particularly behind the lower front teeth and around the gumline. Because tartar is bonded to the tooth, this staining does not brush away and whitening products cannot lift it. A professional clean that removes the tartar usually makes teeth look noticeably brighter and the gums look pinker and healthier.

Frequently Asked Questions

Gail Farmer