Table 1.

PICO Summary of Inclusion and Exclusion Criteria.

	Inclusion	Exclusion
Population
	Both adult and pediatric populations.	Studies on bruxism occurrence in populations with: post-traumatic stress disorder, Down syndrome, respiratory disorders, sleep apnea, cerebral palsy, Alzheimer’s disease, Parkinson’s disease, and temporomandibular disorders. Studies on bruxism occurrence in populations subjected to higher stress environments: military personnel, police officers, prison inmates, etc.
Intervention
	Screening for bruxism (during sleep, awake, or both).
Comparison
	Bruxism subjects (during sleep, awake, or both) versus subjects in good health.
Outcome
	Information in the study on: epidemiology, prevalence, and bruxism (during sleep, awake, or both) population. Assessment scores equal to or greater than 9 according to the author’s scale.	Assessment scores lower than 9 based on the author’s scale. Absence of information regarding ethical committee approval for the study. Lack of information or questionable diagnosis of bruxism.
Study Design
	Studies aimed at evaluating the prevalence of bruxism (during sleep, awake, or both) in various populations. The inclusion criterion for continents required at least two studies with a combined total of more than 500 participants [48].	Narrative reviews Systematic articles Meta-analyses Expert opinions Case reports or series of patients Working language other than English