Generally speaking Kingston dentist whiten teeth  in two ways: they whiten chair side within the office, this treatment is quicker but more expensive results are quick but the effect maybe not as long lasting.  The other option is too take home a whitening kit with custom made trays to do home bleaching.  This takes a little longer however is cheaper than the in-house office bleaching and has less side effects (cold sensitivity), and tends to have a longer lasting effect.  This office prefers the take home  method.