Q. Hey DR.ANDREW,i am a teenager in the age of 18 and i have yellow tooth.i remained 4 the past 5 years not caring about my tooth with drinking pepsi regularly every day and also smoking from about 3 years also most of my food is fastfood.now my teeth are yellow and they look strange as they have different degrees of yellow and they r really really a very big probliem 2 me as i dont have self confidence and some frendz told me i should do teeth bleaching as different whitening products are of no use.plz i am in need of advice.thank u