The thickness of the adhesive layer applied to the tooth may also help to reduce sensitivity, and multiple layers of adhesive may have a better effect than one thinner layer. The use of resin-reinforced glass ionomer cement as a lining on the pulp and axial walls before the use of acid has produced the same effect (16). All these procedures lead to obliteration of the dentinal tubules, and consequently, to eliminating or lowering the incidence of cases of post-operative sensitivity.