Mouth breathing evaluation: use of Glatzel mirror and peak nasal inspiratory flow.

Purpose: To compare the use of the Glatzel mirror and peak nasal inspiratory flow in the evaluation of mouth-breathing participants and to analyze the correlation between these instruments.

Methods: Sixty-four children were evaluated--32 mouth breathers and 32 nasal breathers; the children were aged 4 to 12 years. The mouth breathers were subdivided according to the cause of obstruction by a multidisciplinary team.