![]() ![]() ![]() When all symptoms have subsided - including blistering and scabbing - you are no longer considered contagious. How long are cold sores contagious?Ĭold sores are usually contagious for up to 15 days. If you think you have a cold sore in your mouth, avoid kissing and sharing food, beverages and utensils with others. How do mouth sores spread?Ĭontagious mouth sores - like cold sores caused by the herpes simplex virus - spread through saliva and close contact. If you’re unsure about the type of mouth sore you have, contact your healthcare provider. Cold sores are contagious, but canker sores aren’t. It depends on what type of mouth sore you have. This is especially true for individuals receiving radiation therapy to the head or neck. People who are undergoing cancer treatment may develop mouth sores as well. There are also many diseases and health conditions that can cause mouth sores to develop, including: Brushing your teeth too hard, or using a hard-bristled toothbrush.Irritation from braces or other orthodontic devices.Causes range from common injuries to serious health conditions. There are a number of things that can lead to mouth sores. Difficulty eating (especially spicy or salty foods).In most cases, the lesions will cause redness, pain and inflammation. And while over half of Americans have been infected with the virus that causes cold sores, only 20 to 40% of people develop cold sores as a result.Įxact symptoms can vary depending on the type of mouth sore you have. About 20% of people will develop canker sores at some point in their lives. What’s the most common type of mouth sore?Ĭold sores and canker sores are among the most common types of mouth lesions. For example, while thrush and gingivostomatitis are most common in children, leukoplakia and lichen planus are more common in older adults. Mouth sores can affect anyone, but some are more likely to occur during a certain time in life. Unlike other types of mouth sores, lesions related to oral cancer don’t heal. ![]()
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