Black Dot Inside Mouth: Common Causes and When to See a Dentist

Discovering a black dot inside your mouth or on the inside of your cheek can be unsettling. While your first instinct might be to worry about serious health conditions, most dark spots in the oral cavity are benign and harmless. However, it is important to understand what these spots are and when they require professional attention.

What Causes a Black Dot Inside the Mouth?

Several factors can lead to the appearance of a black or black spot on the inner lining of your mouth. Consider these possible causes and see your dentist for a definitive diagnosis:

• Amalgam Tattoos: If the spot is dark blue, gray, or black, it may be an amalgam tattoo. These are not decorative tattoos but rather the result of leakage from a dental filling. Amalgam is a mixture of tin, zinc, mercury, copper, and silver. After a filling is placed, particles can leak into the tissue, leaving a flat, painless, permanent spot that does not change shape. According to BWH, these are harmless, though you can discuss removal if you find them unsightly.
• Smoker’s Melanosis: According to a study in Case Reports in Dentistry, approximately 22 percent of smokers may notice dark pigmentation in their mouths. Tobacco stimulates excessive melanin deposits on the inner lining of the mouth. While benign, patients should consider the other oral effects of tobacco use and consider quitting.
• Pigmentation and Foreign Objects: The inner lining of your cheek may simply be patchily pigmented. Additionally, benign melanotic macules—similar to freckles—can appear. In some cases, foreign materials like graphite from a pencil can become embedded in the tissue.

When to See a Dentist

While most spots are benign, you should never ignore persistent changes in your oral tissue. Red flags that warrant an immediate dental appointment include:

• The spot grows in size or changes shape over time.
• The area begins to bleed, ulcerate, or becomes painful.
• The spot has an irregular border or raised texture.

It is always worth seeing your dentist if you notice an abnormal spot in your mouth that does not go away. Your dentist can diagnose the cause through an examination and may take a sample for analysis. Report any concerns to your dentist to work together toward a solution.

Frequently Asked Questions

Is a black dot inside my mouth always cancer?

No. While very rarely a spot could be a sign of oral malignant melanoma, it is not likely the case. Most black dots are caused by benign conditions like amalgam tattoos, pigmentation, or minor trauma.

Can I remove a black spot at home?

Never attempt to treat a spot in your mouth at home. Always consult your dentist for a professional diagnosis.

What is a melanotic macule?

An oral melanotic macule is a common, harmless, flat brown or black spot caused by an increase in melanin. It is essentially a benign freckle inside the mouth.

Could my silver filling be the cause?

Yes. If you have an amalgam filling, it is possible for small metal particles to migrate into the nearby cheek or gum tissue, creating a permanent, harmless amalgam tattoo.

Oral Care Center articles are reviewed by an oral health medical professional. This information is for educational purposes only and is not a substitute for professional medical advice.