What is the whitening ingredient in the pen? How does it work? June 17, 2021 13:32 Updated The enamel safe formula contains 3% hydrogen peroxide, a professionally recommended whitening ingredient. Related articles Do my teeth have to be dry before doing the treatment? Can I use this with a mouth guard or Invisalign type of braces? How long until my teeth look whiter? How long does the Colgate Optic White Overnight Teeth Whitening Pen last? How do I use the Colgate Optic White Overnight Teeth Whitening Pen? Comments 0 comments Article is closed for comments.
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