Oral thrush clears up in one to two weeks with antifungal treatment. The infection is caused by an overgrowth of Candida, a yeast that normally lives in your mouth in small amounts. Getting rid of it involves killing the excess yeast, adjusting habits that feed it, and addressing whatever allowed it to overgrow in the first place.
Antifungal Treatment
The most common first-line treatment is nystatin, a liquid antifungal suspension you swish around your mouth and then swallow. Adults and children five and older typically use 4 to 6 milliliters (about a teaspoon) four times a day. It also comes as lozenges or tablets, taken three to five times daily. Treatment usually runs 10 to 14 days, and it’s important to finish the full course even if the white patches disappear sooner. Stopping early can let the yeast bounce back.
For more stubborn infections, your doctor may prescribe a stronger systemic antifungal taken as a pill. This is more common when topical treatments haven’t worked or when the infection is severe. In people with weakened immune systems, thrush can spread down into the esophagus, causing difficulty swallowing and a sensation of food getting stuck in the throat. That level of spread requires more aggressive treatment.
Why It Happened in the First Place
Thrush rarely shows up without a reason. In healthy older children, teenagers, and adults, it’s uncommon enough that its presence often points to something else going on. The most frequent triggers include:
- Medications: Antibiotics wipe out the bacteria that normally keep Candida in check. Inhaled corticosteroids for asthma can also promote yeast growth in the mouth if you don’t rinse afterward.
- Dry mouth: Saliva helps control yeast. Conditions or medications that reduce saliva flow create an environment where Candida thrives.
- Weakened immune system: HIV, cancer treatment, or immunosuppressive drugs all raise the risk significantly.
- Diabetes: Poorly controlled blood sugar feeds yeast. If you keep getting thrush, your doctor may check your blood glucose levels.
- Nutritional deficiencies: Low iron, vitamin B12, or an underactive thyroid have all been linked to recurrent oral thrush.
If thrush keeps coming back, managing the underlying condition is just as important as treating the yeast itself. Getting blood sugar under control, correcting a vitamin deficiency, or switching a medication that causes dry mouth can break the cycle of reinfection.
Dietary Changes That Help
Candida feeds on sugar. Research shows a significant association between frequent consumption of sugary foods and beverages and increased fungal colonization in the mouth. The frequency of sugar intake specifically shifts the balance of microorganisms, giving yeast an advantage over the bacteria that normally compete with it.
While you’re dealing with thrush, cutting back on sugar, refined carbohydrates, and sweetened drinks removes fuel from the yeast. This isn’t a cure on its own, but it supports antifungal treatment and helps prevent recurrence. Focus on whole foods, vegetables, and proteins. Yogurt with live cultures may also be helpful (more on that below).
Probiotics as a Complement
There’s growing clinical evidence that certain probiotic strains can reduce Candida levels in the mouth. Lactobacillus rhamnosus and Lactobacillus acidophilus are the most studied. In one clinical trial involving denture wearers, L. rhamnosus Lr32 reduced oral Candida levels more effectively than nystatin itself. Another trial using a combination of L. rhamnosus and L. acidophilus strains also showed significant improvement.
L. reuteri is another promising strain. It produces a natural antimicrobial compound that inhibits the growth of multiple Candida species. These bacteria appear to work through several mechanisms: competing with yeast for nutrients, disrupting the biofilms Candida builds to protect itself, and stimulating the immune system’s own antifungal responses.
Probiotics aren’t a replacement for antifungal medication, but taking them alongside treatment (through supplements or foods like yogurt and kefir) may speed recovery and reduce the chance of the infection returning.
Oral Hygiene During Thrush
Your toothbrush can harbor yeast and reintroduce it after treatment. Replace your toothbrush at the start of treatment and again once the infection clears. The same logic applies to anything that goes in your mouth regularly: rinse and sterilize it, or replace it.
Brush gently twice a day, but avoid mouthwashes that contain alcohol. Alcohol-based rinses can irritate the already-inflamed tissue and worsen dry mouth, which feeds the problem. A simple saltwater rinse (half a teaspoon of salt in a cup of warm water) can soothe irritation and create a less hospitable environment for yeast.
Denture Care
Dentures are one of the most common culprits in recurring thrush. Candida clings to denture surfaces and reinfects your mouth every time you put them in. A clinical trial found that soaking dentures in a dilute sodium hypochlorite (bleach) solution or chlorhexidine solution for 10 minutes once a week, combined with brushing them three times daily with a toothbrush and toothpaste, effectively reduced microbial levels.
Remove your dentures at night to let your gums breathe. Clean them thoroughly before putting them back in each morning. If your dentures are old, poorly fitting, or cracked, they create more surface area for yeast to colonize, and replacement may be necessary to fully resolve the problem.
Thrush in Breastfeeding Babies
Infants commonly develop oral thrush, and when a baby is breastfeeding, the yeast can pass back and forth between the baby’s mouth and the mother’s nipples. Both mother and baby need to be treated at the same time, even if only one of them has visible symptoms. Breastfeeding can and should continue during treatment.
For the baby, a doctor typically prescribes nystatin suspension applied to the mouth after each feeding for about two weeks. For the mother, the key hygiene steps include washing breasts with plain water after each feeding and air drying them. Avoid leaving expressed breast milk on the skin, as it can encourage yeast growth. If you use breast pads, choose 100% cotton ones without plastic lining and change them after every feeding.
Everything that touches the baby’s mouth (pacifiers, bottle nipples, teethers, toys) should be washed in hot soapy water, then boiled in a covered pot for 10 minutes daily. After one week of antifungal treatment, discard pacifiers, bottle nipples, and teethers and replace them with new ones. One easy-to-miss detail: frozen breast milk expressed during an active infection still contains live yeast. Freezing deactivates it temporarily but doesn’t destroy it, so feeding that stored milk after treatment ends can restart the infection.
Frequent handwashing before and after feeding, before and after handling breasts or expressing milk, and before and after diaper changes is essential to prevent spreading the yeast further. Avoid sharing cups, toothbrushes, or other personal items with family members during this time.