Objective: To investigate the prevalence of self-reported bruxism and its association with temporomandibular disorders (TMD). Hypothesis was that self-reported bruxism is associated with TMD. Methods:The data were gathered from 1,962 subjects, who participated in a field study in 2012-13 including a questionnaire concerning bruxism and TMD symptoms as well as clinical subdiagnoses of TMD using the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD).Statistical method was chi-square test. Bonferroni correction was made and a p-value of <0.003 was considered as significant. Results:The prevalence of self-reported bruxism was 39.6%; 34.0% in men and 44.5% in women.Those who reported sleep bruxism (SB) or awake bruxism (AB) had significantly more painrelated TMD symptoms and signs as compared to those not reporting bruxism. Conclusions:The prevalence of self-reported bruxism is high among middle-aged adults and it is associated with TMD pain-related symptoms and signs, as well as TMD diagnoses.