We're sorry this has been your experience, Fred, and we hope you're feeling better. Since safety is our top priority, we can assure you that our products are thoroughly evaluated to be safe when used as directed. While all of our products are safe and effective, some people may not tolerate a particular formulation. If irritation persists or becomes uncomfortable, discontinue use and consult with your dentist. We'll be sure to pass your comments along, and we'd also like to gather some more details for our Safety Team. When you have a chance, please give us a call at (800) 285-9139.

We're here to help ease your mind, Pam! Like all mouthwash products that effectively fight plaque and gingivitis, Crest Pro-Health Rinses contain an active ingredient that is recognized as safe and effective. Tooth discoloration is actually a sign that our mouthwash is working. After it kills the germs in your mouth, the dead germs can collect on the tooth surface and create the appearance of a stain. This type of discoloration is reversible and preventable, and we'd be more than happy to help you purchase a Crest regimen that will help your daughter smile with confidence again. Whenever you can, could you please give us a call at (800) 285-9139?

We appreciate your feedback on Crest Pro-Health Advantage Multi-Protection Mouthwash and would like to assist you with the active ingredient in question. Please give us a call at (800) 285-9139.

We're sorry to hear you're disappointed with the Crest Pro-Health Advantage Multi-Protection Mouthwash, Lea. Our mouthwashes go through many quality checks to ensure they freshen your breath as expected, as well as many safety checks to ensure they're safe to use as directed. Your experience will be shared with our Quality and Safety team. Based on the symptoms you've shared, we recommend discontinuing use, and holding onto the product, so we can gather more information from you. Please give us a call at 1(800) 285-9139.