The study of bruxism is complicated by some taxonomic and diagnostic aspects that have prevented achieving an acceptable standardization of diagnosis until recent years. Indeed, a major concern for researchers approaching this phenomenon is the definition of bruxism itself, which is a term grouping different entities, namely, sleep and awake bruxism.1 The American Academy of Sleep Medicine defines bruxism as a stereotyped oral motor disorder characterized by sleep-related grinding and/or clenching of the teeth,2 whereas the American Academy of Orofacial Pain extends the definition to the same movements that occur during wakefulness.3