Oral thrush is a fungal infection caused by an overgrowth of Candida yeast in the mouth, and most mild to moderate cases clear up within one to two weeks with topical antifungal treatment applied directly inside the mouth. The infection shows up as creamy white patches on the tongue, inner cheeks, and sometimes the roof of the mouth, gums, or tonsils. These raised patches often look like cottage cheese and may bleed slightly if scraped. Along with the visible patches, you may notice a cottony feeling in your mouth, loss of taste, burning or soreness that makes eating difficult, and cracking at the corners of your lips.
Topical Antifungal Treatments
For mild to moderate thrush, the standard treatment is an antifungal gel or liquid applied directly inside the mouth for 7 to 14 days. The most commonly prescribed options are clotrimazole, miconazole, and nystatin. These work by breaking down the cell walls of the Candida fungus, killing it at the site of infection.
If you’re prescribed nystatin liquid, the typical dose is 1 ml taken four times a day, with at least three hours between doses. The key to making it work: hold the liquid in your mouth for at least 30 seconds, swishing it around like a mouthwash before swallowing. This gives the medication time to coat all the infected surfaces. Nystatin usually clears the infection within about a week, but you’ll need to keep taking it for two additional days after symptoms disappear to make sure the fungus is fully eliminated.
Treatment for Severe Cases
When thrush is more severe, or when topical treatments haven’t worked, doctors typically prescribe an antifungal pill. Fluconazole is the most common choice. A standard course starts with a higher loading dose on the first day, followed by a lower daily dose for at least two weeks. Severe infections that spread beyond the mouth, particularly in people with weakened immune systems, may require intravenous antifungal treatment in a medical setting.
Home Remedies That Help
Saltwater and baking soda rinses won’t cure thrush on their own, but they can ease discomfort and create a less hospitable environment for the fungus while your antifungal medication does its work.
For a saltwater rinse, dissolve half a teaspoon of salt in a cup of warm water. Swish it around your mouth for one to two minutes, then spit it out. For a baking soda rinse, use the same ratio: half a teaspoon of baking soda in a cup of warm water, swished and spit. You can alternate between these throughout the day.
Eating cold, soft foods like yogurt or smoothies can soothe the soreness. Avoid spicy, acidic, or very hot foods and drinks, which tend to irritate the already inflamed tissue.
What About Diet Changes?
You may have seen advice about “candida diets” that eliminate sugar, white flour, yeast, and cheese. The theory is that these foods feed Candida overgrowth. In practice, there are no clinical trials showing that a candida cleanse diet treats any diagnosed medical condition. Cutting processed foods and refined sugar is generally good for your health, but it’s not a substitute for antifungal treatment when you have an active infection.
Probiotics and Oral Thrush
Certain probiotic strains show promise against Candida in laboratory and animal studies. Lactobacillus species, in particular, appear to fight the fungus through several mechanisms: producing acids, hydrogen peroxide, and natural antimicrobial compounds, while also physically competing with Candida for space on the surfaces of your mouth. Some strains also appear to stimulate immune responses that help keep Candida in check.
That said, the human clinical evidence is still limited. Eating probiotic-rich foods like yogurt or taking a probiotic supplement is unlikely to hurt and may offer some support alongside conventional treatment, but probiotics alone aren’t a reliable way to clear an active thrush infection.
Denture Care to Prevent Reinfection
Dentures are one of the most common sources of recurring thrush. Candida clings to acrylic denture surfaces and reinfects your mouth each time you put them back in. If you wear dentures, remove them every night and clean them thoroughly.
Research comparing different denture cleaning methods found that brushing with a toothbrush, soaking in a commercial denture-cleaning tablet solution, or combining both were the most effective ways to remove Candida from denture material. All three performed equally well. Soaking in mouthwash or using UV light were better than water alone but not as effective as brushing or cleaning tablets. The simplest approach: brush your dentures with a soft toothbrush and soak them overnight in a denture-cleaning solution.
Preventing Thrush if You Use a Steroid Inhaler
Corticosteroid inhalers used for asthma and COPD are a well-known trigger for oral thrush. The steroid particles that land in your mouth suppress the local immune response, giving Candida an opening to overgrow. The fix is simple: rinse your mouth with water and spit after every dose, then brush your teeth. Using a spacer device with your inhaler also helps by reducing the amount of medication that deposits in your mouth and throat rather than reaching your lungs.
Why Some People Get Thrush Repeatedly
A single episode of oral thrush is common and often tied to a specific trigger, like a course of antibiotics, steroid inhaler use, or wearing dentures. But recurring thrush can signal an underlying issue worth investigating. Conditions that weaken the immune system or change the balance of organisms in your mouth increase susceptibility. Uncontrolled diabetes raises risk because elevated blood sugar in saliva feeds Candida growth. Dry mouth, whether from medications or medical conditions, removes one of the mouth’s natural defenses against fungal overgrowth. People undergoing chemotherapy, taking long-term corticosteroids, or living with HIV are also at significantly higher risk.
If thrush keeps coming back despite proper treatment, or if it’s your first episode and you don’t have an obvious trigger, that pattern is worth bringing to your doctor. Persistent or unexplained thrush sometimes turns out to be the first visible sign of an undiagnosed condition affecting your immune system.