Canker Sores vs. Cold Sores: What’s the Difference?

It can be challenging to know whether you’re dealing with a canker or a cold sore when it comes to sores in or around your mouth. Although they might seem similar, they have distinct differences that are important to understand. Knowing what sets them apart can help you manage your symptoms more effectively and seek the proper treatment when necessary.

Understanding Canker Sores

Canker sores are small, shallow lesions that develop on the soft tissues inside your mouth. Unlike cold sores, canker sores are not caused by a virus and are not contagious. They are often painful, especially when eating or talking, and they usually heal within a week or two.

• Location: Inside the mouth, on the gums, inner cheeks, tongue, or the soft palate.
• Appearance: Round or oval with a white or yellow center and a red border.
• Causes: It may be triggered by stress, hormonal changes, food sensitivities, or minor injuries, like biting your cheek.
• Treatment: Pain relief gels, avoiding spicy or acidic foods, and good oral hygiene can help.

Most canker sores are mild and don’t require professional treatment. However, if they become unusually large, last longer than two weeks, or are accompanied by other symptoms like fever, you should consider seeing a dentist.

Understanding Cold Sores

Cold sores, also known as fever blisters, are caused by the herpes simplex virus (HSV-1). Unlike canker sores, cold sores are highly contagious and can spread through close contact, such as kissing or sharing utensils. Cold sores typically appear on the lips or around the mouth and go through several stages, from tingling and redness to blistering and crusting.

• Location: Usually on the lips, around the mouth, or face.
• Appearance: Start as small blisters that eventually break open and crust over.
• Causes: Triggered by the herpes simplex virus, often activated by stress, sunburn, or a weakened immune system.
• Treatment: Antiviral creams, oral medications, and avoiding triggers can help manage outbreaks.

Cold sores can be uncomfortable and unsightly but generally heal within two to four weeks. Because they are contagious, avoiding close contact with others when you have an active sore is essential.

If you’re ever unsure about what kind of sore you’re dealing with, it’s best to consult a dentist who can diagnose properly and recommend the best course of action.

How a Dentist Can Help

Though both canker sores and cold sores are typically harmless, there are times when you might need to see a dentist. If your sores are particularly painful, last longer than expected, or you experience frequent outbreaks, it’s time to make an appointment. Our dental office in Austin can help provide: 

• Accurate Diagnosis: Determine whether it’s a canker or a cold sore.
• Effective Treatment: Provide topical treatments, antiviral medications, or other remedies to reduce symptoms.
• Preventative Advice: Help you understand and manage the factors that may trigger your sores.

Understanding the difference between canker and cold sores is crucial for managing oral health. If you’re looking for a dentist in Austin who can provide individualized care and advice, don’t hesitate to reach out to us. We’re here to help you with all your dental needs!

About The Author

Dr. Eric S. Broberg

Dr. Eric S. Broberg loves making people smile, which inspired him to pursue dentistry. He is certified in the safe administration of laser dentistry, oral sedation, and nitrous oxide. He is also an expert in Invisalign and ClearCorrect clear aligner therapies. He has been recognized as a Nextdoor Neighborhood Favorite for four consecutive years. Dr. Broberg is a member of the Texas Dental Association, American Dental Association, Capital Area Dental Society, and the Psi Omega Dental Fraternity.

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