Health Library

Trench mouth

Vincent's stomatitis; Acute necrotizing ulcerative gingivitis (ANUG); Vincent disease

Trench mouth is an infection that causes swelling (inflammation) and ulcers in the gums (gingivae). The term trench mouth comes from World War I, when this infection was common among soldiers "in the trenches."

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Causes

Trench mouth is a painful form of gum swelling (gingivitis). The mouth normally contains a balance of different bacteria. Trench mouth occurs when there is too much abnormal (pathologic) bacteria. The gums become infected and develop painful ulcers. Viruses may be involved in allowing the bacteria to grow too much.

Things that increase your risk of trench mouth include:

• Emotional stress (such as studying for exams)
• Poor oral hygiene
• Poor nutrition
• Smoking
• Weak immune system
• Throat, tooth, or mouth infections

Trench mouth is rare. When it does occur, it most often affects people ages 15 to 35.

Symptoms

Symptoms of trench mouth often begin suddenly. They include:

• Bad breath
• Crater-like ulcers between the teeth
• Fever
• Foul taste in the mouth
• Gums appear red and swollen
• Grayish film on the gums
• Painful gums
• Severe gum bleeding in response to any pressure or irritation

Exams and Tests

Your health care provider will look into your mouth for signs of trench mouth, including:

• Crater-like ulcers filled with plaque and food debris
• Destruction of gum tissue around the teeth
• Inflamed gums

There may be a gray film caused by broken down gum tissue. In some cases, there may be fever and swollen lymph nodes of the head and neck.

Dental x-rays or x-rays of the face may be taken to determine how severe the infection is and how much tissue has been destroyed.

This disease may also be tested for by using a mouth or throat swab culture.

Treatment

The goals of treatment are to cure the infection and relieve symptoms. Your provider may prescribe antibiotics if you have a fever.

Good oral hygiene is vital to the treatment of trench mouth. Brush and floss your teeth thoroughly at least twice a day, or after each meal and at bedtime, if possible.

Salt-water rinses (one half teaspoon [tsp] or 3 grams [g] of salt in 1 cup [c] or 240 milliliters [ml] of water) may soothe sore gums. Hydrogen peroxide, used to rinse the gums, is often recommended to remove dead or dying gum tissue. Using a chlorhexidine rinse will help with gum inflammation.

Over-the-counter pain relievers may reduce your discomfort. Soothing rinses or coating agents may reduce pain, especially before eating. You may apply lidocaine to your gums for severe pain.

You may be asked to visit a dentist or dental hygienist to have your teeth professionally cleaned and to have the plaque removed, once your gums feel less tender. You may need to have numbing medicine for the cleaning. You may need frequent dental cleaning and exams until the disorder is cleared.

To prevent the condition from coming back, your provider may give you instructions on how to:

• Maintain good general health, including proper nutrition and exercise
• Maintain good oral hygiene
• Reduce stress
• Stop smoking

Avoid irritants such as tobacco and hot or spicy foods.

Outlook (Prognosis)

The infection usually responds to treatment. The disorder can be quite painful until it is treated. If trench mouth is not treated promptly, the infection can spread to the cheeks, lips, or jawbone. It can destroy these tissues.

Possible Complications

Complications of trench mouth include:

• Dehydration
• Weight loss
• Loss of teeth
• Pain
• Gum infection (periodontitis)
• Spread of infection

When to Contact a Medical Professional

Contact a dentist if you have symptoms of trench mouth, or if a fever or other new symptoms develop.

Prevention

Preventive measures include:

• Good general health
• Good nutrition
• Good oral hygiene, including thorough tooth brushing and flossing
• Learning ways to cope with stress
• Regular professional dental cleaning and exams
• Stopping smoking

Related Information

References

Chow AW. Infections of the oral cavity, neck, and head. In: Blaser MJ, Cohen JI, Holland SM, et al, eds. Mandell, Douglas and Bennett's Principles and Practice of Infectious Diseases. 10th ed. Philadelphia, PA: Elsevier; 2026:chap 66.

Dhar VK. Periodontal diseases. In: Kliegman RM, St. Geme JW, Blum NJ, et al, eds. Nelson Textbook of Pediatrics. 22nd ed. Philadelphia, PA: Elsevier; 2025:chap 359.

Klokkevold PR, Carranza FA. Acute gingival infections and management. In: Newman MG, Klokkevold PR, Elangovan S, Hernandez-Kapila YL, eds. Newman and Carranza's Clinical Periodontology and Implantology. 14th ed. Philadelphia, PA: Elsevier; 2023:chap 17.

National Institute of Dental and Craniofacial Research website. Periodontal (gum) disease. www.nidcr.nih.gov/health-info/gum-disease. Reviewed November 2024. Accessed April 1, 2026.

Simon L, Silk H. Diseases of the mouth. In: Kellerman RD, Rakel DP, Heidelbaugh JJ, Lee EM, eds. Conn's Current Therapy 2026. Philadelphia, PA: Elsevier; 2026:1122-1127.

Review Date: 2/5/2026  

Reviewed By: Michael Kapner, DDS, General Dentistry, Norwalk Medical Center, Norwalk CT. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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