According to Loyola-Rodriguez et al. (30), microabrasion is carried out by rubbing an abrasive paste prepared
with pumice stone and 37% phosphoric acid gel over the pigmented enamel surface, during 10 seconds, and then
washing it during 20 seconds. A 10% chloridic acid solution can be also used associated with different abrasive
particles. Some sessions can be done, with breaks of 15 days, until good results are obtained (30).