The disorders that affect the temporomandibular joint (TMJ) are responsible for the diverse symptoms. Objective: To evaluate whether or not the relationship between signs or symptoms of TMD and presence of harmful habits. The investigators evaluated 244 adolescents enrolled in public school . The investigators used the questionnaire for selection of orofacial pain and temporomandibular disorders, recommended by American Academy of Orofacial Pain to assess the presence or absence of signs and symptoms of TMD.