Hi
sorry ,but fluorosis will not go away.You can try to whiten it,but, that may make it more obvious.A porcelain veneer would be your best choice.They are expensive,but can last many years.A composite resin (tooth colored filling )might be an option,these discolor over time and don't look as good as veneers.Save your money or see if your dentist
does offer a low rate loan designed for dental treatment.Many dentists do.
Good luck!!