From Crest.com

What to Do If You Experience a Toothpaste Allergy

If you have an allergic reaction to your toothpaste, swap it for another brand or flavor. The symptoms should go away on their own soon after. However, if symptoms persist or become too severe, see your healthcare professional right away, as it may be a sign of something more serious.

Fortunately, once you recognize which ingredient is causing your allergy, there’s plenty of varieties of toothpaste to choose from. In some cases, a reaction can be the result of sensitivity. Switching to a sensitivity toothpaste can help.

A toothpaste allergy can easily be averted with the right switch, so it never has to hinder your oral hygiene. After you’ve identified the specific cause of your allergy, you’ll be better prepared to pick the right toothpaste for you and avoid the varieties that may trigger an allergic reaction in the future.