This chapter helps dental practitioners to evaluate whether their thinking is unassertive, including not saying what they are thinking, interpretation of a lack of response, and believing that resolution can be achieved by not saying anything. Assertiveness is important to their professional lives. It ensures that practitioners' interests are understood by others. It helps them stick up for their colleagues who may be being treated badly. It's part of the reality of personality differences that some individuals relish social interaction, and others find the experience more difficult. Like the physical immune system that defends their bodies against illness, our mind is alert to protect their from potential unhappiness. Criticism is something practitioners can avoid easily by saying nothing, doing nothing, and being nothing. The absence of any personal criticism indicates a lack of drive to achieve anything new or different.