“…The etiology of dysphonia is attributed to a variety of causes: inadequate phonation technique (1,2) (vocal abuse), individual factors (3) (illness, muscular hypertension, posture, stress, emotional issues, habits), and work-environment related agents (4)(5)(6) . It is well known that teachers speak during long periods in classrooms full of students where acoustics is usually not the best, and also exposed to different temperatures and chemical conditions.…”