Removal of pigmentation from gums is called depigmentation. This procedure will cost you anywhere between 5000 to 20000 depending on the doctor, technique, area involved and other factors. It can be done with laser also. Teeth whitening procedures also generally cost the same depending on number of teeth involved and amount of discoloration present.
Next Steps
For exact cost, you need to see a dentist who can evaluate all factors and give an estimate.
Health Tips
Depigmentation of gums and teeth whitening procedures should be done only if they are really required and conditions are favorable. Usually dark people have blackish gums and fair people have pinkish gums. if a dark person gets depigmentation done, it will look bad on the whole. Similarly, teeth whitening procedures cause sensitivity. So get these done accordingly after weighing all factors.