What Does Oral Thrush Look Like? Pictures, Symptoms, and Treatment

What Does Oral Thrush Look Like?

Oral thrush usually shows up as creamy white patches on the tongue, inner cheeks, or roof of the mouth. The patches often look like cottage cheese and can be wiped off, leaving a red, raw, sometimes-bleeding base underneath.¹³

Thrush, known clinically as oral candidiasis, is a yeast infection caused by overgrowth of the fungus Candida albicans. Small amounts of Candida live in most people’s mouths without causing problems.¹ When the balance shifts, the fungus multiplies and the visible patches appear.³

Thrush has three common visual forms. Each looks slightly different, so knowing which one you’re seeing helps you describe it to a dentist or doctor.¹²

Pseudomembranous Thrush (the Classic White Form)

This is the form most people picture. Cream-colored or white plaques sit on the tongue, palate, or inner cheeks and look much like curdled milk or cottage cheese. The plaques wipe away with gentle pressure, exposing a sore red surface that may bleed slightly.³¹²

Erythematous Thrush (the Red Form)

Erythematous (also called atrophic) thrush appears as smooth, flat, red patches without the white film. The tongue often loses its normal texture and looks raw or shiny. This form is easier to overlook than the classic white form because it lacks the obvious coating, and it tends to feel sore or burning. It commonly follows a course of antibiotics or develops under poorly cleaned dentures.⁵¹²

Angular Cheilitis (Cracks at the Corners of the Mouth)

Angular cheilitis is cracked, red, sometimes crusted skin at the corners of the mouth. It often appears alongside thrush, especially in people who wear dentures or have saliva pooling at the mouth corners. Candida is one contributor, but irritation from saliva, bacteria, and nutritional gaps can also be involved — so treatment depends on what’s actually driving it.⁵¹²

Symptoms of Oral Thrush

Common symptoms include:¹⁷

• White patches or lesions on the tongue, palate, cheeks, or inner lips
• Sore mouth, lips, cheeks, tongue, or throat
• Redness around the lesions
• Dry or cracked lips, especially at the corners
• Decreased sense of taste
• A burning sensation in the mouth
• Cottonmouth or dry mouth
• Pain or difficulty swallowing — this can be a sign that thrush has spread to the esophagus and warrants a same-day call to your dentist or doctor⁷

What Causes Oral Thrush?

Oral thrush develops when something disturbs the normal balance of microbes in the mouth and lets Candida overgrow. Antibiotics, weakened immunity, dry mouth, dentures, and uncontrolled diabetes are the most common triggers.⁶

Antibiotics

Antibiotics knock down both harmful and beneficial bacteria. With fewer beneficial bacteria competing for space, Candida has room to multiply.⁶

According to Dr. Khushbu Gopalakrishnan, NewMouth’s in-house dentist, “Antibiotics, although necessary, can upset the balance of microbes in your mouth. Ask your dentist or doctor whether a probiotic food or supplement is a good fit for you — it’s not the right choice for everyone.”

Dry Mouth

Saliva washes away food, neutralizes acid, and keeps fungal populations in check. When the salivary glands produce too little saliva, the risk of thrush rises.⁶

Poor Oral Hygiene and Old Toothbrushes

An old toothbrush can harbor fungus that reinfects the mouth. Replace your toothbrush every three to four months, or sooner if the bristles are visibly matted or frayed.¹⁰ The ADA notes that worn bristles clean less effectively and are more likely to harbor microorganisms. Brushing twice daily with fluoride toothpaste and cleaning between your teeth regularly is the foundation of prevention.¹⁰

Cancer Treatment

Oral thrush is the most common fungal infection in people receiving cancer treatment. Chemotherapy and radiation suppress the immune system, which lets Candida overgrow.⁶

Inhaled Steroids

Inhaled corticosteroids used for asthma or COPD can leave medication in the mouth and lower local immune defenses, which raises the risk of Candida overgrowth. Rinsing your mouth with water and spitting after every dose lowers that risk.⁶

Dr. Gopalakrishnan adds, “Steroids compromise the immune system. If you use a steroid inhaler regularly, rinse and spit after each use to clear residue from the mouth.”

Uncontrolled Diabetes

High blood sugar feeds Candida and weakens the immune response. People with poorly controlled diabetes have a higher risk of thrush than those who keep blood sugar in range.⁶

Bottles and Pacifiers

Pacifiers and baby bottles can keep a baby’s mouth too moist, creating an environment where yeast thrives. Do not put a baby to bed with a bottle. Pacifiers, on the other hand, can be offered for sleep under AAP safe-sleep guidance — they actually lower SIDS risk — but skip cords or attachments, and wash pacifiers and bottle nipples with soap and water unless your pediatrician advises otherwise.²¹¹

The American Academy of Pediatrics recommends weaning from pacifier use between ages 2 and 4 to reduce the risk of dental and oral problems.¹¹

Dentures

Dentures that don’t fit well or aren’t cleaned thoroughly trap Candida against the palate. Denture stomatitis — a red, sometimes-sore patch shaped like the denture — is one of the most common forms of oral thrush in older adults.⁶

Weakened Immune Systems

People with HIV/AIDS, those taking immunosuppressant drugs, and others with weakened immunity are at higher risk. In these cases, thrush can become serious because the body cannot fight the infection on its own.⁶

Oral Thrush Treatments

Oral thrush is usually not serious in healthy people, but it can become more serious if it spreads to the throat or esophagus or occurs in someone with a weakened immune system.⁵ With proper treatment, mild thrush clears within a few days to two weeks. If it doesn’t resolve in that window, contact your general dentist.⁵

Topical antifungals are first-line for mild cases. Oral fluconazole is standard for moderate-to-severe cases or in immunocompromised patients.⁸⁹

1. Antifungal Medications

Antifungal medications stop Candida from growing. Common options include nystatin, clotrimazole, miconazole, itraconazole, and fluconazole. Topical forms — lozenges, troches, and oral suspensions — work well for mild infections, while oral fluconazole is the standard prescription for moderate-to-severe thrush or for people with weakened immune systems.⁸⁹

2. Antiseptic Rinses

Antiseptic mouthwashes such as chlorhexidine are adjunctive at best — they are not a primary treatment for oral thrush. A dentist may recommend one as supportive care alongside antifungal medication, but antiseptic mouthwash alone will not clear a Candida infection.⁸

3. Probiotics

Some probiotic products may help support oral microbial balance, but they are not a substitute for antifungal treatment. Yogurt with live cultures is a reasonable adjunct to prescribed therapy, not a stand-alone cure.³

4. Throat Lozenges

For adults and older children who can use them safely, over-the-counter throat lozenges can ease discomfort while antifungal medication does the work. Do not give lozenges to babies or young children — they are a choking hazard.

How Do You Prevent Oral Thrush?

The best way to prevent thrush is to practice good oral hygiene.¹³ Brush twice a day with fluoride toothpaste, clean between your teeth daily, and replace worn toothbrushes.¹⁰¹³

Children and adults should:

• Brush teeth with fluoride toothpaste twice a day
• Floss or use interdental cleaners once a day
• Replace toothbrushes every three to four months
• Clean oral appliances such as retainers and dentures regularly
• Rinse and spit after every dose of an inhaled steroid
• Ask your dentist whether a mouth rinse is appropriate, especially if you have dry mouth or recurrent thrush — overuse of antiseptic rinses can alter oral flora¹²

Visit a dentist every six months for teeth cleanings and to catch early signs of thrush before they worsen.¹³

When to See a Dentist or Doctor

Most cases of thrush respond to treatment quickly, but some signs need prompt evaluation. Call your dentist or doctor if you have:⁵⁷

• Suspected thrush that persists, worsens, or keeps coming back — or does not improve after prescribed treatment
• Pain or difficulty swallowing, which can signal that thrush has spread to the esophagus
• Thrush with no obvious risk factor (no recent antibiotics, inhaled steroids, dentures, or diabetes) — this warrants a workup for an underlying immune issue
• Recurrent thrush in an infant past 6 months of age
• Bleeding, severe pain, fever, or signs of a wider infection

Same-day evaluation is appropriate for difficulty swallowing or systemic symptoms, especially in anyone with a weakened immune system.⁵

Oral Thrush in Babies and Children

Infants are most vulnerable to thrush during their first year of life because their immune systems are still developing.²⁴ A baby with thrush usually shows white patches on the tongue, gums, or inside the cheeks that look like leftover milk but won’t wipe away easily.²

Young children are more likely to develop thrush if they:²⁴

• Have taken antibiotics for an illness
• Use a steroid inhaler for asthma and don’t rinse afterward
• Don’t clean orthodontic appliances before use
• Have a weakened immune system
• Frequently use a pacifier (babies)
• Were born prematurely or had a low birth weight

A newborn can develop thrush if exposed to a vaginal yeast infection during delivery.⁵ Treatment usually involves a liquid antifungal medication prescribed by a pediatrician.²