Microabrasion techniques for elimination of discoloration of teeth work by:
Surface discolorations because of fluorosis can also be removed by microabrasion, if the discoloration is within 0.2 to 0.3 mm removal depth limit.
In 1984, McCloskey reported the use of 18% HCI swabbed on teeth for the removal of superficial fluorosis stains. 
Subsequently, in 1986, Croll modified the technique to include the use of pumice with the HCl to form a paste applied with a tongue blade.
Removing surface enamel
Bleaching stains
Bleaching developmental defects
All of the above