Crest White Strips: Where can you get them in Taipei?
I am in Australia right now and most of the toothpaste brands seem to have some form of whitening thing going on. A lot of people have white teeth here.
Non, most use hydrogen peroxide as a whitener. Total bull, just a sales pitch.
How can the color of the teeth change? The actual white of your teeth is under a layer of glazing. The best way to get whiter teeth is to get a tan. 
Or … have them removed and get a new set of teeth.
Nobody has natural white teeth, they are all off white, so something that’s not white to start with … 
Pastes with an abrasive inside is just scratching your teeth, so after many years of use it will leave … right no more teeth 
If it’s to remove stains … that’s different, but the best way is avoiding stuff that stains your teeth … coffee, cigarettes etc …
The seller is this person
tw.user.bid.yahoo.com/tw/user/cd072738?
I think mine came about 2-3 business days after it was ordered.
According to dentists, this is the best drgeorges.com/buy-teeth-whitening-online.asp
It is the same stuff that you get at the dentist and SO inexpensive. Only issue is that I am unsure they will ship to Taiwan. SO you might have to have someone in the US ship it to you.