Q. Hello, when i was young i had mumps which lead to my teeth not developing correctly, as a result i have horrible patchy yellow-ish marks on my teeth and they are generally in bad condition, i find that my gums often bleed and even eating some foods make my teeth feel as if they are just going to break off. Obviously i want to get them whitened and was wondering how much this would cost? Any other tips would be helpful because i REALLY do not want to have my teeth falling out before i even get to university in september. xx,