Hydrophobicity of soft tissue surfaces in the human body, including those of the human oral cavity, has been described for decades as playing an important role in many biological processes, like cellular adhesion [1], contact inhibition, elasticity [2], tissue membrane functions, intracellular structures [3], and adhesion of infectious microorganisms [4]. Generally, tissues with absorption and exchange functions, or when needed, lubrication, tend to be more hydrophilic. On the other hand, tissues requiring protection against pathogenic microorganisms or acids tend to be hydrophobic [5].