What happens if i brush my teeth religiously for three months will they get whiter?

Probably not: Brushing alone does not whiten teeth. You should be evaluated by a local dentist to see if professionally applied bleaching products are right for you. You want to look good, right? You're going to have to spend a little bit to make it happen.

No: Took 39 years to stain them. 3 months brushing will not appreciably whiten them. See your Dentist to start whitening process with a professional cleaning to remove surface stain. Then have Dentist create customized whitening program that will be effective and not cause harm. Please seek effective safe professional care.