Scaling or Cleaning of teeth is most commonly advised treatment by a dentist which removes the adherent tartar and food particles in between teeth and also between teeth and gums.
External stains on the teeth which can not be removed by simple brushing can be removed by scaling and polishing.
Scaling is the procedure done by state of art ,modern ultrasonic technique which does not cause any harm or scratches on the natural tooth structure. This is virtually painless procedure. Scaling also removes external stains on the teeth are caused by smoking, tobacco, tea and coffee intake etc. Even if the person does not have these habits still stains are observed. That is because of few chromogenic bacteria present in the saliva which causes these stains.