Brown and Black Spots on Teeth: Stain or Cavity? Causes and Removal
Updated: 9 hours ago
Brown spots on teeth are most often surface stains from coffee, tea, wine or tobacco. But brown or black spots can also be tartar or tooth decay, and the difference matters: stains are cosmetic, while decay needs treatment.
The table below shows the signs that point to a stain or a cavity. Our office also explains what causes brown and black spots, how dentists remove them, what is safe to try at home, and when to book an exam.
Stain or Cavity? How to Tell the Difference
A few simple signs can help you tell a stain from a cavity.
Sign | More likely a stain | More likely a cavity |
Pattern | Spread across several teeth or the whole surface | One isolated spot |
Texture | Smooth | Rough, soft or sticky |
Feeling | No pain | Sensitive to sweets, hot or cold |
Over time | Stays about the same | Grows or gets darker |
Location | On the smooth front surface | In grooves, between teeth or near old fillings |
These signs are only a guide. Early decay can look like a stain, and some cavities hide between teeth where you cannot see them. Only a dental exam and X-rays can confirm what a spot is, so have it checked if you are unsure.
What Causes Brown Spots on Teeth?
Cleveland Clinic groups tooth discoloration into two types: extrinsic stains, which sit on the surface, and intrinsic stains, which come from inside the tooth. Brown spots can be either.
Coffee, Tea, Wine and Other Dark Drinks
Dark drinks contain pigments, such as tannins and chromogens, that stick to enamel. Each cup adds a little more, so stains build up over time. They often show first along the gum line and in tiny surface grooves. For more detail, see our guide to foods and drinks that cause teeth discoloration.
Smoking and Tobacco
Nicotine and tar leave yellow-brown to dark brown stains. They tend to collect near the gum line and between teeth, where brushing reaches less easily. Chewing tobacco stains in the same way.
Tartar Buildup
Plaque that is not removed hardens into tartar (also called calculus). Tartar is porous, so it soaks up stains and turns yellow or brown. It often forms behind the lower front teeth and along the gum line. You cannot brush it away. Only a professional teeth cleaning removes it.
Tooth Decay
A brown spot on a tooth can be early decay. Watch for spots in the grooves of back teeth, between teeth, or around the edges of old fillings. Decay often turns light brown before it becomes a hole, and it can darken as it grows.
Fluorosis and Enamel Defects
Fluorosis is usually linked to white spots, but more severe cases can cause brown mottling or pitting. Enamel hypoplasia, where enamel forms thinner than normal, can also leave brown patches. These spots formed while the teeth were developing.
Medications and Supplements
Tetracycline antibiotics taken in childhood, while teeth are forming, can cause gray-brown bands inside the teeth. Liquid iron supplements and chlorhexidine mouthwash (a prescription rinse) can leave brown surface stains. Talk to your doctor before stopping any medication.
Old Fillings, Trauma and Aging
Old silver fillings can cast a gray or dark shadow through the tooth. A tooth that was injured can slowly darken from the inside as the nerve changes. With age, enamel also wears thinner, letting more of the darker, yellow-brown layer underneath (dentin) show through.
What Causes Black Spots on Teeth?
Black spots on teeth have some of the same causes as brown spots, but a few are specific to black:
Cavities. A black dot in the groove of a back tooth, or a dark spot that feels soft, is often decay.
Black stain. This is a harmless bacterial stain that forms a thin dark line or dots near the gum line. It is most common in children and is linked to bacteria that produce iron compounds, as described in an NIH-published case report. It is not decay, and it tends to come back after cleaning.
Tartar below the gum line. Tartar under the gums can turn dark brown or black from blood pigments.
Amalgam fillings. Old silver fillings can look black or make the tooth around them look gray.
A dead or dying tooth. When the nerve inside a tooth dies, often after an injury, the tooth can turn gray or black.
A black spot on a tooth is more likely to need an exam than a light brown one. Dark color often means decay has progressed or something has changed inside the tooth.
Brown or Black Spots Between Teeth or Near the Gum Line
Spots in these two areas usually point to one of two causes.
Cavities between teeth. Decay often starts where two teeth touch, because food and plaque collect there and brushing does not reach. You may see a shadow or dark line, but many of these cavities are visible only on X-rays.
Tartar at the gum line. Tartar forms where the tooth meets the gum and picks up brown stains easily. Below the gum, it can look dark or black.
This is why flossing matters. It removes the plaque that leads to both, in the places a toothbrush cannot reach.
How Dentists Remove Brown and Black Spots
The right fix depends on whether the spot is a stain, tartar or decay. We always start with the most conservative option.
Professional cleaning and polishing. This removes tartar and most surface stains from coffee, tea, wine and tobacco. It is often the only treatment needed.
Professional teeth whitening. Whitening lightens surface stains and brightens the overall shade. It does not change the color of fillings, crowns or most intrinsic stains, such as tetracycline bands.
Conservative fillings for decay. If a spot is a cavity, we remove only the decayed tooth and rebuild it with tooth-colored materials. Our biomimetic approach uses non-invasive fillings that preserve as much healthy tooth as possible.
Bonding for small intrinsic spots. A thin layer of tooth-colored composite can cover a small spot that whitening cannot reach.
Veneers as the last option. For deep, widespread discoloration that other treatments cannot fix, porcelain veneers can cover the front of the teeth.
Can You Remove Brown Spots on Teeth at Home?
Only mild surface stains. Brushing twice a day with a whitening toothpaste can lighten light stains over a few weeks. Rinsing with water after dark drinks also helps.
Nothing at home removes tartar or decay. Those need a dentist.
Be careful with popular natural remedies:
Charcoal powder is abrasive and can scratch enamel.
Lemon juice and vinegar are acidic and dissolve enamel.
Frequent baking soda scrubbing can wear the surface down over time.
Thinner enamel lets more of the yellow-brown layer underneath show through, so these remedies can make teeth look darker in the long run.
Spots in Other Colors
Green, orange or yellow spots usually have different causes, often bacteria or plaque buildup. For greenish spots, our guide to green stains on teeth explains the causes and how to remove them.
How to Prevent Brown and Black Spots
A few daily habits keep most brown stains on teeth from building up:
Rinse your mouth or drink water after coffee, tea and wine.
Use a straw for iced coffee, iced tea and other dark cold drinks.
Quit smoking and other tobacco use.
Brush twice a day and floss once a day.
Keep up regular cleanings to remove tartar before it stains.
Treat dry mouth, since saliva helps wash away pigments and bacteria.
When to See a Dentist
Book an exam if you notice:
A spot that is new, growing or getting darker
A black dot that feels soft or catches your floss
Pain or sensitivity to sweets, hot or cold
A tooth that is darkening after an injury
Brown or black spots on a child's teeth
Caught early, decay can often be treated with a small, conservative filling.
Brown and Black Spot Treatment in NYC at Lazare Biomimetic Dentistry & Smile Design
At our Upper East Side office on East 61st Street, Dr. Marc Lazare and our team check whether a spot is a stain, tartar or decay. Then we treat it with the most conservative option first, from a professional cleaning to a minimally invasive filling. If you have noticed brown or black spots on your teeth, we invite you to book an exam.
Brown and Black Spots on Teeth: FAQs
Are black spots on teeth always cavities?
No. Black spots can also be harmless black stain, tartar below the gum line, or the edge of an old silver filling. But a black spot in a groove or one that feels soft is often decay, so it is worth having checked.
Can brown spots on teeth go away?
Surface stains can fade with whitening toothpaste and good brushing, and a professional cleaning removes most of them. Brown spots from decay, fluorosis or medications will not go away on their own and need a dentist's care.
Can teeth whitening remove brown spots?
Whitening can lighten brown stains on the surface of the teeth. It does not remove tartar or treat decay, and it does not change the color of fillings or crowns. Deep intrinsic stains may need bonding or veneers instead.
Why do I have brown spots on my teeth even though I brush?
Brushing removes plaque but cannot always remove pigments from coffee, tea, wine or tobacco, or tartar that has already hardened. Brown spots can also come from inside the tooth, such as early decay or enamel defects. A cleaning and exam will show the cause.
Are black stains on kids' teeth normal?
A thin black line near the gum line in children is often black stain, a harmless bacterial stain. It is cosmetic and can be polished off, although it may return. Any black spot that looks like a hole or feels soft should be checked for decay.
Is a black dot on a tooth an emergency?
Usually not, but it should not be ignored. Book an exam soon, especially if the dot is growing or the tooth is sensitive. Severe pain, swelling or fever needs prompt dental care.
