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Canker Sores, Cold Sores and Infections


Canker Sores (Aphthous Stomatitis or Recurrent Mouth Ulcers)

About 20 of every 100 people get canker sores. Smaller canker sores usually heal within a couple of weeks. They do not leave scars. Read "Canker Sores (Aphthous Stomatitis or Recurrent Mouth Ulcers)" article

Cold Sores and Fever Blisters

What Is It? Cold sores and fever blisters are caused by herpes simplex virus type 1 (HSV-1). This virus is passed from person to person by saliva (either directly, or by drinking from the same glass or cup) or by skin contact. Cold sores usually appear as clusters of tiny blisters on the lip. About 8 out of 10 people have the virus that causes cold sores. Most people are first infected before they are 10 years old. Read "Cold Sores and Fever Blisters" article


What Is It? The salivary glands contain a network of tiny tubes called ducts. Saliva flows through them into the mouth. If the flow is reduced or stopped for some reason, bacteria can grow. Read "Sialadenitis" article

Scrotal Tongue

What Is It? When grooves develop in the tongue, the condition is called scrotal tongue. It makes the tongue look wrinkled. Scrotal tongue has other names, too. Read "Scrotal Tongue" article


What Is It? Cheilosis is a painful inflammation and cracking of the corners of the mouth. It also is called cheilitis. It sometimes occurs on only one side of the mouth, but usually involves both sides. Read "Cheilosis/Cheilitis" article

Oral First Aid at Home

You probably have a first aid kit in your home to handle life's minor bumps and bruises. But are you prepared for a dental emergency? Read "Oral First Aid at Home" article

What are Canker and Mouth Sores?

Mouth irritations and oral lesions are swellings, spots or sores on your mouth, lips or tongue. Although there are numerous types of mouth sores and disorders, among the most common are canker sores, cold sores, leukoplakia and candidiasis (thrush). Read "What are Canker and Mouth Sores?" article

Oral thrush

Oral thrush — Comprehensive overview covers symptoms, causes, treatment of this fungal infection. Read "Oral thrush" article

Tooth abscess

Tooth abscess — Comprehensive overview covers symptoms, causes, treatment of this painful tooth condition. Read "Tooth abscess" article

Canker sore

Canker sore — Comprehensive overview covers causes, treatment and prevention of these painful mouth sores. Read "Canker sore" article

Videos and Interactive Guides

How to Brush

Learn the technique recommended for the best cleaning.

How to Floss

Find simple instructions for effective flossing.

Fresh Breath Assessment

How fresh is your breath? Find out by visiting the Fresh Breath Institute.

Guide to Brushing

Test your brushing skills with our FUN 3-D brusher.

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