my name is Hayat khan. i am 18 years old.
i have native problem about my teeth.
my teeth are yellow and some of them back sides are black since childhood.
i brush every day twice time in a day,but my teeth are not going white i have to tried but in vian i used different kinds of tooth cream such as colgate,close up,signal , but doctor now i need your help what i should do now thanks i shall be waiting for your answer.