What Is Calculus on Teeth?
Calculus is a hard, mineralized deposit that forms on teeth when dental plaque is not removed. Plaque is a soft, sticky film of bacteria that constantly forms on tooth surfaces. When plaque stays on the teeth long enough, minerals in saliva (primarily calcium and phosphate) crystallize within the plaque, turning it into a hard substance that bonds tightly to the tooth enamel or root surface.
You may know calculus by its more common name: tartar. The terms are interchangeable. Dental professionals typically use the term calculus, while patients are more familiar with tartar. Regardless of the name, the problem is the same: a hard deposit that you cannot remove at home and that promotes gum disease if left in place.
How Calculus Forms on Teeth
Calculus formation begins with plaque. Within hours of eating, bacteria in the mouth begin forming a thin biofilm on tooth surfaces. If this plaque is not disrupted by brushing and flossing, it starts to absorb minerals from saliva and from the fluid that seeps from the gums (called crevicular fluid).
The mineralization process can begin within 24 to 72 hours after plaque forms, though it takes days to weeks for calculus to become fully hardened. Once calculus is established, its rough surface makes it even easier for new plaque to accumulate on top of it, creating a cycle of buildup that accelerates over time.
Factors That Increase Calculus Buildup
Some people form calculus faster and more heavily than others. Several factors contribute to this variation.
- Saliva composition: People whose saliva is higher in calcium and phosphate tend to form calculus more quickly. This is partly genetic.
- Saliva flow rate: Higher saliva flow can increase mineral availability, speeding up calculus formation.
- Oral hygiene habits: Inconsistent brushing and flossing leaves more plaque on the teeth, giving it more time to mineralize.
- Diet: Diets high in sugar and starch feed the bacteria that produce plaque. Smoking and tobacco use also increase buildup.
- Dry mouth: While lower saliva flow means fewer minerals, dry mouth conditions can shift the bacterial balance in ways that promote calculus formation in some patients.
- Crowded or misaligned teeth: Teeth that overlap or sit at angles create areas that are harder to clean, allowing plaque to accumulate.
Supragingival vs. Subgingival Calculus
Calculus forms in two distinct locations, and understanding the difference matters because each type poses different risks and requires different treatment approaches.
Supragingival Calculus (Above the Gumline)
Supragingival calculus forms on the visible portion of the tooth, above the gumline. It is typically yellowish or white and is easiest to see on the inner surfaces of the lower front teeth and the outer surfaces of the upper molars. These areas are closest to the openings of the salivary glands, which is why mineral-rich saliva deposits calculus there first.
Supragingival calculus is the type you can sometimes see or feel with your tongue as a rough, hard buildup near the gumline. While it contributes to gum irritation, it is generally easier to remove and less damaging than subgingival calculus.
Subgingival Calculus (Below the Gumline)
Subgingival calculus forms on the root surfaces of teeth, below the gumline, inside the gum pockets. It is typically dark brown or black because it absorbs pigments from blood products in the inflamed gum tissue. You cannot see or feel subgingival calculus yourself.
This type is more harmful because it sits in direct contact with the gum tissue and the bone that supports the tooth. The bacteria harbored in and around subgingival calculus trigger a chronic inflammatory response that, over time, destroys the connective tissue and bone holding the tooth in place. This is the progression from gingivitis to periodontitis.
Why You Cannot Remove Calculus at Home
Once plaque has mineralized into calculus, it bonds to the tooth surface with a strength that a toothbrush, floss, or mouthwash cannot break. No over-the-counter product dissolves or loosens established calculus. Products marketed as tartar-control toothpaste help prevent new calculus from forming, but they do not remove calculus that already exists.
Attempting to scrape calculus off your teeth at home with dental picks or sharp instruments is not recommended. Without proper training and tools, you risk damaging the enamel, cutting the gum tissue, pushing bacteria deeper into the gum pockets, or causing an infection. Professional dental instruments are specifically designed to remove calculus without harming the tooth or surrounding tissue.
Professional Calculus Removal: Scaling and Root Planing
Professional calculus removal is called scaling. During a scaling procedure, a dental hygienist or dentist uses specialized hand instruments (scalers and curettes) and ultrasonic devices to remove calculus from the tooth surfaces both above and below the gumline.
Routine Scaling (Prophylaxis)
A routine dental cleaning, called prophylaxis, includes scaling to remove supragingival calculus and light subgingival deposits. This is the standard cleaning performed at your regular 6-month dental checkup. It is appropriate for patients with healthy gums or mild gingivitis.
During prophylaxis, the hygienist removes calculus and plaque from all tooth surfaces, polishes the teeth to smooth the enamel, and may apply fluoride. The appointment typically takes 30 to 60 minutes.
Deep Cleaning (Scaling and Root Planing)
When calculus has accumulated below the gumline and gum pockets have deepened (a sign of periodontitis), a deeper cleaning called scaling and root planing is required. This procedure involves removing calculus from the root surfaces of the teeth and smoothing (planing) the roots so the gum tissue can reattach more closely to the tooth.
Scaling and root planing is typically performed under local anesthesia because it involves working below the gumline where the tissue is sensitive. The procedure may be completed in one visit or split across two to four visits, depending on the extent of the buildup. A periodontist, a specialist in gum disease, performs or oversees this treatment when the disease is moderate to severe.
Ultrasonic vs. Hand Scaling
Ultrasonic scalers use high-frequency vibrations and a water spray to break calculus off the tooth surface. They are efficient for removing large amounts of supragingival calculus. Hand instruments (curettes) are used for precise removal of subgingival calculus and for smoothing root surfaces. Most dental professionals use a combination of both methods for thorough calculus removal.
How Calculus Leads to Gum Disease
Calculus itself does not directly destroy gum tissue or bone. However, its rough, porous surface provides an ideal environment for bacterial plaque to accumulate and thrive. It is the bacteria in and around the calculus that trigger the inflammatory response leading to gum disease.
The progression follows a predictable pattern. Plaque and calculus buildup at the gumline irritates the gum tissue, causing gingivitis (red, swollen gums that may bleed when brushing). If the calculus is not removed, the inflammation worsens. Gum pockets deepen as the tissue pulls away from the teeth. Subgingival calculus forms on the root surfaces within these pockets.
As the cycle continues, the body's immune response to the bacteria begins to break down the connective tissue and bone supporting the teeth. This is periodontitis, the advanced form of gum disease. According to the Centers for Disease Control and Prevention (CDC), nearly half of adults aged 30 and older in the United States have some form of periodontal disease. Calculus buildup is one of the primary contributing factors.
Cost of Calculus Removal
The cost of calculus removal depends on whether you need a routine cleaning or a deeper treatment.
Routine Cleaning (Prophylaxis)
A routine dental cleaning typically costs between $75 and $200 without insurance. Most dental insurance plans cover two prophylaxis appointments per year at little or no out-of-pocket cost to the patient.
Scaling and Root Planing
Scaling and root planing typically costs between $150 and $350 per quadrant (the mouth is divided into four quadrants). A full-mouth deep cleaning can range from $600 to $1,400 total. Most dental insurance plans cover a portion of scaling and root planing when documented as medically necessary. Costs vary by location, provider, and case complexity.
Periodontal Maintenance
After scaling and root planing, patients with a history of gum disease typically need periodontal maintenance cleanings every 3 to 4 months instead of the standard 6-month interval. These maintenance visits cost between $100 and $300 per visit. The more frequent schedule helps prevent calculus from rebuilding in the deeper pockets.
How to Prevent Calculus Buildup
You cannot completely eliminate plaque formation (it is a natural biological process), but you can prevent plaque from hardening into calculus by removing it before it mineralizes.
Daily Oral Hygiene Habits
- Brush at least twice a day with a fluoride toothpaste. Spend a full two minutes, reaching all tooth surfaces including the inner surfaces of the lower front teeth where calculus forms most quickly.
- Use a soft-bristled or electric toothbrush. Electric toothbrushes with oscillating or sonic action have been shown to remove slightly more plaque than manual brushes.
- Floss daily. Calculus often forms between teeth and just below the gumline in areas a toothbrush cannot reach.
- Consider an antiseptic mouthwash. Rinses containing chlorhexidine or cetylpyridinium chloride can reduce bacterial plaque, though they are not a substitute for brushing and flossing.
- Use a tartar-control toothpaste. These contain pyrophosphate or zinc citrate, ingredients that slow the mineralization of plaque into calculus.
Professional Cleanings
Regular dental cleanings every 6 months (or every 3 to 4 months for patients prone to heavy buildup or with a history of gum disease) are essential for removing calculus before it causes damage. Even with excellent home care, most people develop some amount of calculus in hard-to-reach areas that only professional scaling can address.
When to See a Periodontist for Calculus Removal
Your general dentist or dental hygienist handles routine calculus removal during regular cleanings. However, when calculus buildup has led to significant gum disease, a periodontist provides the specialized care needed to manage the condition.
You should see a periodontist if your dentist has measured gum pockets deeper than 4 millimeters, if you have signs of bone loss on dental X-rays, if your gums bleed frequently or are pulling away from the teeth, or if you have had scaling and root planing before but the condition is not improving. A periodontist is a dental specialist with 3 additional years of training in treating gum disease, performing surgical gum treatments, and placing dental implants.
Find a Periodontist Near You
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