<s>[INST] My teeth has turned yellow color. I went to a dental doctor. the doctor suggested that these stains will not go by simple brushing. I need to undergo scling. He has given appointment for scaling. [/INST] Hi Rash, Scaling is a procedure for cleaning teeth which is followed by polishing to remove stains and any other deposits accumulated in time. Scaling as I am sure as your dentist would have mentioned needs to be done every 6 months. The external stains may go with scaling and polishing, but this does not result in whitening. Whitening of teeth is an entirely different procedure in which teeth lighten by 3-4 shades from the normal color or sometimes even more. This procedure is commonly referred to as bleaching. There are 2 types of whitening procedure. One is done in clinic called in office procedure and the other is done by the patient in the house called home whitening. If you desire whitening, please consult your dentist for the same. Regards </s>