Oral thrush in adults typically clears up within one to two weeks with antifungal medication, but getting rid of it fully often means addressing whatever caused the overgrowth in the first place. The infection is caused by Candida yeast, which normally lives in your mouth in small amounts but can multiply out of control when conditions shift in its favor. Here’s what works to treat it, speed recovery, and keep it from coming back.
Recognizing Thrush Before You Treat It
Thrush shows up as creamy white patches or spots, usually on the tongue or inner cheeks. They’re slightly raised and often described as looking like cottage cheese. If you scrape or rub them, they may bleed slightly. Beyond the visible patches, you might notice a burning or sore feeling in your mouth, cracking and redness at the corners of your lips, a cottony sensation, or difficulty eating and swallowing.
Thrush is uncommon in otherwise healthy adults. If you develop it, that’s a signal worth paying attention to. Common triggers include recent antibiotic use (which kills off bacteria that normally keep yeast in check), corticosteroid inhaler use, diabetes, a weakened immune system, dry mouth, and wearing dentures. Treating the thrush itself is straightforward, but identifying and managing the underlying cause is what prevents it from returning.
Antifungal Medication
Prescription antifungals are the most reliable way to clear thrush. A typical oral treatment starts with a higher dose on the first day, then drops to a lower daily dose for at least two weeks. Your provider may instead prescribe a liquid antifungal that you swish around your mouth and swallow. Most people need to take medication for 10 to 14 days, and symptoms generally resolve within that window.
If your thrush is mild, your provider may start with a topical approach, like a medicated mouth rinse or lozenges that dissolve in your mouth. These deliver the antifungal directly to the affected tissue. For more stubborn or recurring infections, or if the yeast has spread to your esophagus (you’ll know because swallowing becomes painful or difficult), a systemic oral medication is the standard approach.
Salt Water Rinses and Home Care
While antifungals do the heavy lifting, a simple salt water rinse can soothe irritation and create a less hospitable environment for yeast. Dissolve about half a teaspoon of salt in one cup of warm water. Swish it around your mouth for 30 seconds or so, then spit it out. You can do this several times a day alongside your medication.
Keeping your mouth clean matters more than usual during an active infection. Brush gently with a soft-bristled toothbrush twice a day, and replace your toothbrush once the infection clears so you don’t reintroduce yeast. If you use mouthwash, avoid alcohol-based formulas that can dry out or further irritate your mouth.
Cutting Back on Sugar
Candida yeast feeds on sugar. Research has linked diets high in refined sugar, simple carbohydrates, and ultra-processed foods with increased Candida growth. You don’t need a radical dietary overhaul, but while you’re treating thrush, reducing sugary foods and drinks can help your body fight the infection more effectively. This means easing up on candy, soda, pastries, and sweetened beverages until your symptoms resolve.
Probiotics as a Supporting Strategy
Certain probiotic bacteria, particularly Lactobacillus strains, can help restore the microbial balance in your mouth that keeps Candida in check. These bacteria work in several ways: they produce acids and other compounds that directly inhibit yeast growth, they compete with Candida for space on the surfaces of your mouth, and they activate parts of your immune system involved in controlling fungal infections. Some strains can even interfere with the early stages of yeast biofilm formation, making it harder for Candida to establish a foothold.
Lactobacillus rhamnosus and Lactobacillus reuteri are among the most studied strains for oral Candida. You can find these in probiotic supplements and in fermented foods like yogurt and kefir. Probiotics aren’t a replacement for antifungal medication, but they’re a useful addition, especially if you’re prone to recurring infections.
Prevention for Inhaler Users
If you use a corticosteroid inhaler for asthma or another respiratory condition, you’re at higher risk for thrush because tiny amounts of the medication settle in your mouth and suppress local immune defenses. The fix is simple: rinse your mouth thoroughly with water and spit after every dose. Following up by brushing your teeth reduces the risk even further. Using a spacer device with your inhaler also helps by ensuring more medication reaches your lungs and less deposits in your mouth and throat.
Denture Care to Prevent Recurrence
Dentures are one of the most common culprits behind recurring thrush in adults. Candida easily colonizes denture surfaces and reinfects your mouth night after night if the appliance isn’t cleaned properly. The American College of Prosthodontists recommends cleaning dentures daily by both soaking and brushing them with a nonabrasive denture cleanser. Effervescent denture tablets dissolved in warm water are effective for soaking, and you can follow up by brushing with a denture paste or mild soap and a soft-bristled brush.
Avoid using bleach or powdered household cleansers, which can damage the denture material. Remove your dentures at night to give your gums a break and reduce the warm, moist environment yeast thrives in. If you’ve had a thrush infection, thoroughly disinfecting your dentures before wearing them again is essential to avoid reinfection.
What Recovery Looks Like
Most people start feeling relief within a few days of beginning antifungal treatment, though the white patches may take a full one to two weeks to completely disappear. Soreness and the cottony feeling in your mouth typically improve before the visible patches clear. If your symptoms aren’t improving after two weeks of treatment, or if they come back shortly after finishing medication, that’s a sign your provider needs to investigate further. Recurring thrush in adults can point to undiagnosed diabetes, immune system issues, or other conditions worth identifying.
If at any point swallowing becomes painful or feels like food is getting stuck, the infection may have spread to your esophagus. This requires prompt medical attention and typically a stronger or longer course of treatment.