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An injury to the mouth
Certain viruses and illnesses
Canker sores are the most common type of mouth sore. They are usually white with red borders. Other types of mouth sores can be white, red, or yellow. Your child may have a single sore or more than one at the same time. Mouth sore symptoms can include:
Increase in saliva
Fever or headache
NOTE: If your child has a sore outside the mouth, it’s likely a cold sore. Cold sores can be spread through direct contact. They may require different treatment from mouth sores. Ask your child’s doctor for more information about cold sores if you think your child has one.
A mouth sore is diagnosed by how it looks. To get more information, the doctor will ask about your child’s symptoms and health history. The doctor will also examine your child. You will be told if any tests are needed.
Mouth sores generally go away within 7 to 10 days with no treatment.
You can do the following at home to relieve your child’s symptoms:
Give your child over-the-counter (OTC) medications, such as ibuprofen or acetaminophen, to treat pain and fever. Do not give ibuprofen to infants 6 months of age or less or to a child who is dehydrated or constantly vomiting. Do not give aspirin to a child with a fever. This can put your child at risk of a serious illness called Reye’s syndrome.
Cold liquids, ice, or frozen juice bars may help soothe mouth pain. Avoid giving your child spicy or acidic foods.
Use the following treatments only if your child is over the age of 4:
Apply an OTC numbing gel to mouth sores to relieve pain. The gel can cause a brief sting when applied.
Have your child rinse his or her mouth with saltwater or with baking soda and warm water, then spit. The mouth rinse should not be swallowed.
A mouth sore that doesn’t go away within 14 days
Increased mouth pain
Signs of infection around a mouth sore (pus, drainage, or swelling)
Signs of dehydration (very dark or little urine, excessive thirst, dry mouth, dizziness)
In an infant under 3 months old, a rectal temperature of 100.4°F (38.0°C) or higher
In a child 3 to 36 months, a rectal temperature of 102°F (39.0°C) or higher
In a child of any age who has a temperature of 103°F (39.4°C) or higher
A fever that lasts more than 24-hours in a child under 2 years old, or for 3 days in a child 2 years or older
Your child has had a seizure caused by the fever