DEAR DR. GOTT: While using an estrogen cream, I was struck by the thought that if this just passes through my skin into my system, what does my sunless tanner and teeth whitener do to me? There isn’t a day that goes by that I don’t use at least one product on my skin or in my mouth. Do all these chemicals have risks for me? What’s your opinion?

DEAR READER: To my knowledge, the use of sunless tanner and teeth whitener is safe. There have been no “red flags” to suggest any serious toxic reactions from the compounds. There is a possibility of allergic reaction to some of these products in sensitive individuals but they are generally mild and symptoms stop when the product is discontinued or shortly thereafter. If you are truly concerned, speak to your physician or pharmacist who may be of assistance.