Gum Health
What causes white spots on gums?
15 July 2026 · The Dentist, Al Qusais, Dubai
The short answer
Most white spots on gums are canker sores, a coating of oral thrush, or a small patch of irritation from biting or a rough filling, and these tend to settle within one to two weeks. Less commonly, a white patch that doesn't heal, feels leathery, or keeps coming back can be leukoplakia or lichen planus, which need a dentist to check under proper light. If a spot is painful, growing, or lasts longer than two weeks, get it looked at rather than waiting it out.
The common, harmless causes
Canker sores, known clinically as aphthous ulcers, are the most frequent reason for a white spot on the gum. They show up as a small round patch with a yellowish-white centre and a red halo around it, often after you've bitten the inside of your cheek, eaten something acidic, or gone through a stressful week. They sting when you eat salty or spicy food and usually clear up on their own within seven to ten days.
Oral thrush, a yeast overgrowth caused by Candida, produces a creamy white coating rather than a single spot, and it can appear on the gums, tongue, and inner cheeks together. It's more common in people using inhaled steroids, wearing dentures, taking antibiotics, or with a weakened immune system. Wiping it gently often reveals a red, sometimes bleeding surface underneath, which is a useful clue if you're trying to tell it apart from an ulcer.
A simpler explanation is trauma. A rough edge on a filling, a sharp piece of food, overly firm brushing, or biting the gum while eating can leave a small white blister of irritated tissue. These heal within a few days once the source of friction is removed.
When a white patch is not the harmless kind
Leukoplakia is a thickened, white or greyish patch that doesn't wipe away and can feel slightly raised or leathery under your tongue. It's linked to chronic irritation, most often from smoking, tobacco use, or ill-fitting dentures rubbing the same spot repeatedly. It's usually painless, which is exactly why people ignore it, but any patch that persists beyond two to three weeks needs a dentist to examine it and, if needed, take a small sample to rule out anything more serious.
Oral lichen planus shows up as lacy white lines or patches, sometimes with red, sore areas mixed in, and tends to come and go over months rather than resolving cleanly. It's thought to be related to the immune system reacting to the tissue lining the mouth, and while it's manageable, it's a diagnosis that should come from a professional rather than a guess based on how it looks in the mirror.
A fibroma, a small firm bump that forms after repeated minor irritation in one spot, can also appear pale or whitish. It's benign and painless, but it doesn't go away by itself the way an ulcer does, so if you've noticed the same small bump sitting in the same place for months, that's worth mentioning at your next visit.
What to do about it in Al Qusais
If the spot is small, not too painful, and you can point to a likely cause such as a bitten cheek or a new rough filling, give it ten to fourteen days and keep the area clean with gentle brushing and warm salt water rinses. If it's still there after that, if it's spreading, if you have several patches at once, or if swallowing and speaking feel uncomfortable, that's the point to stop waiting.
At The Dentist in Al Qusais, the first checkup is free for new patients, which makes it an easy first step rather than something you have to weigh up. Dr. Faris Alkhanafseh and Dr. Mohammad Nour can look at the spot directly, check whether it's linked to a filling edge, denture fit, or something needing further investigation, and tell you plainly what it is rather than leaving you to search symptoms online. Call or WhatsApp 056 349 8888 to book, open Monday to Friday 11:00 to 21:00 and Saturday 13:00 to 21:00.
This article is general information, not a diagnosis. If you are in Dubai, the free first checkup at our Al Qusais clinic is the fastest way to get an answer about your own teeth.