I incorrectly purchased MI Paste Plus which has fluoride in it versus MI Paste. I tried contacting customer service via email (there is no telephone support) and nobody responded to my request to do an exchange, or return and then repurchase. They sent me a request to do a review and I gave them a one star rating. Wouldn't you know it, they seem to scrub all one, two, and three star ratings at the very least. Only a few four star ratings show up among the predominate five star ratings. I would pay a little more at other websites so you won't have any customer service issues. I've never run into such an unethical website company before!