Can I use whitening toothpaste while using Whitestrips?
Yes. We recommend using Crest 3D White Radiant Mint Toothpaste while you're whitening your teeth to help maintain your white smile.
Is using a toothpaste that contains peroxide while using Whitestrips harmful?
The combined amount of peroxide from the toothpaste and Crest 3D White Whitestrips (professional or retail) isn't harmful.
Can I add additional peroxide to the strip before applying it to my teeth?
No, this is not recommended. No data is available on the safety of effectiveness of adding additional peroxide to Crest 3D White Whitestrips. Adding anything to the strip will affect its ability to stick to the tooth surface, thus affecting whitening results.