Is it safe to use crest 3d whitening strips over emax veneers?

I have to emax veneers on my two front teeth, i've done teeth whitening before fitting them, and now noticed my natural teeth getting yellower in comparsion, i've decided to use crest 3d strips (i've used 35% opalescence gel two times before with whitening trays before doing veneers), i know veneers won't change in color but i was just wandering if its harmful to use whitening gel on them (whether strips or trays)

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