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Should I tell the school if my child has canker sores?

Canker sores are not contagious. Your child will not spread these at school to others. If your child eats school-prepared lunches, you may want to instruct the school or your child to avoid hot, spicy or acidic foods that can irritate the sore until it goes away, typically within a week.
There is no need to tell school authorities that your child has canker sores. Canker sores are not contagious like some other mouth sores, such as cold sores. You can't spread canker sores by sharing food or kissing someone.

Aphthous stomatitis (canker sore) is not contagious, so you do not need to tell the school if your child has an outbreak. However, you may want to let the teacher know so he or she can supervise your child in applying medication. The ulcers may cause pain during the day, and the medication will help relieve the pain so that your child can concentrate better on school work.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.