Dentin demineralization of over 5 µm is not of much value to the clinical procedure, and may result from longer exposure of dentin to the acid. An increase in the demineralized dentin layer will not guarantee the formation of a thicker hybrid layer and a better bond, as the primer/adhesive may not have the capacity to infiltrate throughout its entire thickness, causing exposure of the collagen within and at the base of the hybrid layer, which could lead to degradation and leakage.