When a white film forms in the mouth: causes and management of oral candidiasis
Oral candidiasis is a fungal infection that develops when Candida already living in the mouth overgrows, and its typical look is the white patches called thrush. In Korea, the National Health Information Portal explains that Candida is present in the mouth of 45 to 65% of healthy infants and 30 to 55% of healthy adults, and advises that the fungus increases and shows up as disease when dentures are worn, the mouth is dry or antibiotics are taken for a long time. Fixing the causes together is needed to reduce recurrence.
Key facts
| Candida carriage | 45 to 65% of healthy infants, 30 to 55% of healthy adults (source: KDCA National Health Information Portal) |
|---|---|
| Most common form | Thrush (pseudomembranous candidiasis), white patches on the cheek, palate, lip and tongue (source: KDCA National Health Information Portal) |
| Feature of the white patches | They rub off easily and the area beneath bleeds easily (source: KDCA National Health Information Portal) |
| Triggers | Dentures, steroid inhalers, dry mouth, uncontrolled diabetes, weakened immunity, chemotherapy or radiation, long-term use of broad-spectrum antibiotics (source: KDCA National Health Information Portal) |
| When the mouth is dry | Angular cheilitis or red erythema forms are more common than white patches (source: KDCA National Health Information Portal) |
| Diagnostic tests | Confirm the fungus by microscopic examination and culture (source: Seoul National University Hospital) |
What does oral candidiasis look like?
The most common form is pseudomembranous candidiasis, also called thrush. The National Health Information Portal explains that white patches form on the cheek lining, palate, lips and tongue, rub off easily, and the lining beneath bleeds easily. It looks like milk curds, so it is sometimes mistaken for food.
Not every candidiasis looks white. The dry mouth information on the National Health Information Portal explains that candidiasis in people with a dry mouth more often appears as angular cheilitis, where the corners of the mouth become raw, or as red erythema, rather than the typical white patches. For people who wear dentures, also pay attention to red changes where the denture touches.
Why does oral candidiasis happen?
Candida is commonly present in the mouths of healthy people too, so having the fungus does not by itself make it a disease. When the balance of saliva, immunity and the bacteria in the mouth is broken, the fungus increases and causes symptoms. The triggers named by the National Health Information Portal and Seoul National University Hospital's medical information are below. Seoul National University Hospital's medical information explains that candidiasis also easily develops in people with wasting or immune diseases.
- Denture use, especially with poorly cleaned dentures
- Steroid inhalers used for asthma and the like
- Dry mouth (xerostomia)
- Uncontrolled diabetes
- Weakened immunity, chemotherapy or radiation therapy
- Long-term use of broad-spectrum antibiotics
How is oral candidiasis diagnosed and treated?
The look is checked at the exam, and if needed the white film is scraped and viewed under a microscope or the fungus is confirmed by culture. Seoul National University Hospital's medical information explains that Candida can be confirmed by these tests and that taking an antifungal and keeping the mouth clean help treatment.
The National Health Information Portal explains that if there is a causative drug such as a broad-spectrum antibiotic, stopping or changing it is considered first, and antifungals such as nystatin suspension or mouthwash and clotrimazole mouthwash are used. If symptoms are severe, an oral antifungal is used together. Do not stop the medicine you were taking on your own; discuss it with the prescribing doctor.
If white patches keep remaining after treatment begins or the same spot becomes firm, get examined again. The National Cancer Information Center of the National Cancer Center describes leukoplakia, a white lesion on the oral lining that cannot be wiped off, as a lesion that may be precancerous, so a white patch that does not rub off must be told apart from candidiasis.
How can people who use dentures or inhalers prevent it?
The dry mouth information on the National Health Information Portal advises that people who wear dentures must disinfect them every day so that mold does not grow. Seoul National University Hospital's medical information also recommends cleaning dentures thoroughly and leaving them out during sleep. While the dentures are out, gently brush the gums and tongue too.
People who use steroid inhalers should confirm, when it is prescribed, how to rinse the mouth after use. If your mouth is dry, drink water in small amounts often and cut back on things that dry the mouth further, such as caffeine, alcohol and tobacco. If you have diabetes, controlling blood sugar also helps prevent candidiasis. If a denture fits poorly and there is a sore on the gum, inflammation easily overlaps there, so also have the condition of the denture checked regularly.
What should I do about white patches in a baby's mouth?
According to the National Health Information Portal, 45 to 65% of healthy infants carry Candida in the mouth, and Seoul National University Hospital's medical information explains that candidiasis is especially common in young children. If white patches on the baby's tongue or inside the cheek remain even after feeding and a red base shows when wiped, it may be thrush.
If the baby seems to hurt or cannot feed well while nursing or taking formula, see a pediatrician. Wash and dry bottles, nipples and pacifiers thoroughly, and do not scrub the white patches off hard with gauze. If thrush keeps recurring even after treatment, discuss at the visit how to care for feeding equipment and whether there is any other cause.
Common myths and facts
Myth: A white film in the mouth is food residue, so rubbing it off hard is enough.
The National Health Information Portal explains that the white patches of candidiasis rub off and the lining beneath bleeds easily. It is a fungal infection, so antifungal treatment after an exam is needed.
Myth: Oral candidiasis occurs only in babies.
According to the National Health Information Portal, 30 to 55% of healthy adults also carry Candida in the mouth, and candidiasis occurs in adults too when there are factors such as dentures, diabetes, inhalers and antibiotic use.
Frequently asked questions
Does oral candidiasis spread to other people?
The National Health Information Portal classifies oral candidiasis as infectious stomatitis. However, Candida is commonly present in the mouths of healthy people too, so personal triggers such as dentures, dry mouth and weakened immunity play a large part in whether disease develops. Keep a baby's bottles and nipples cleaned separately.
Is a white tongue always candidiasis?
A tongue covered white all over is often just tongue coating. The white patches of candidiasis also form inside the cheek, on the palate and on the lips, and they rub off and show red underneath. If it is hard to tell, have it checked at the dentist. If the tongue turns white again soon after cleaning and stings, get examined.
My mouth turned white after taking antibiotics. What should I do?
The National Health Information Portal names long-term use of broad-spectrum antibiotics as a trigger of oral candidiasis. Do not stop the antibiotic on your own; tell the prescribing doctor or dentist about the symptoms and confirm whether antifungal treatment is needed. If white patches remain even after finishing the antibiotic, get care.
Do people with diabetes get oral candidiasis more easily?
The National Health Information Portal names uncontrolled diabetes as a trigger of oral candidiasis. If candidiasis recurs often, check the state of blood sugar control too, and if you have a dry mouth, manage that cause as well. It is good to mention mouth symptoms when you receive diabetes care.
Once oral candidiasis is treated, won't it come back?
If the triggers are left as they are, it easily returns. Even after symptoms disappear, it is important to keep up management of the causes, such as denture disinfection, dry mouth care and blood sugar control. Use the prescribed medicine for the set period even if symptoms improve.
Related topics
- Mouth sores and oral pain
- Mouth sores and oral pain
- Denture sores
- Dry mouth
- Tongue coating and bad breath
- Mouth sore care