We're sorry you're having this experience, and we hope that you're feeling better. We can assure you that all of our products are thoroughly evaluated to be safe when used as directed, though some people may not tolerate a particular formulation. If this persists or becomes uncomfortable, discontinue use and consult with your dentist. So that we can learn more and gather some additional details for our Safety Team, please give us a call at (800) 285-9139 when you have a moment.