Good morning madam Teeth whitening will severe 9-12 months and how you maintain it And after bleaching you will have slight A sensitivity which will subside after 2-3  days and we will give u desensitizing agents so no problem it's pain less procedure You have in-house and dental office bleaching but I would suggest you to go for office bleaching once your familiar with procedure your dentist will give you at home bleach  which will be safe to use

Bleaching cost varies from 5000 to 15000 depending upon the bleaching system you choose. The effects last for a year or so. If done by a dental professional, bleaching is safe