Ok I am totally confused. I use the 1.1 and I am being told not to use it but 10 minutes max per day. I swear it is actually making my teeth whiter.
As to whiting, both my Business Partner and I had our teeth whitened several years ago. Within a year, this was BC (Before Cancer) both of us started having to get multiple crowns. Of course the dentist said there was no connection. I will not ever do it again.