Expectations are beliefs or assumptions about future events; they allow individuals to be prepared and guide their behaviour when the anticipated situation occurs. Cognitive biases represent judgements about a situation which deviate from norm and rationality. Unrealistic optimism is the tendency for people to believe that a personal future outcome will be more favourable than that suggested by a relevant, objective standard. A growing number of individuals undergo into aesthetic interventions to their body, motivated by interpersonal and/or societal factors. Not all of these individuals are satisfied with the results of the interventions and the unrealistic expectations about the interventions is a contributing factor, alongside with other situational factors. Both clients and aesthetic professionals must be aware of their (unrealistic) expectations regarding aesthetic interventions I order to make the most appropriate decisions.