No fixed answer : Sadly -- the agents ( hydrogen, carbamide and urea) peroxide are the different formulations of whitening chemistries available. Depends on the concentration of the agents, the tooth / teeth being whitened etc. Determines how and when the whitening will occur. In take home kits its gradual and additive when done on consecutive days / nights. In office systems can be in about an hour.
Answered 6/23/2013
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