According to the type of mask used, there was no difference in the number of days with headache in the month prior to the survey, 13.4 (SD: 7.4) vs 12.6 (SD: 6.9); nor in the previous week, 3.9 (SD: 1.6) vs 3.6 (SD: 1.7); but in the intensity according to VAS, 5.7 (SD: 1.5) vs 6.5 (SD: 1.2), p=0.004.