In the office, they use light/laser to acitvate

來源: chinesebuns 於 2012-08-21 17:01:50 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (312 bytes)
回答: I did go to my dentist where she did 由 Gardenia_On_The_Bay 於 2012-08-21 15:46:05

the whitening gel to bleach the teeth, the whitening process is faster than the take home one. :)) It takes about an hour. They use higher concertration of bleaching agent( hydrogen perioxide) The whitening gel you took home probably is Carbamide Perioxide with lower concentration of HP, less irritation.

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