The Efficacy of the NHS Waterpipe in Superficial Hydration for People With Healthy Voices: Effects on Acoustic Voice Quality, Phonation Threshold Pressure and Subjective Sensations.

Objectives: This study examined the efficacy of the NHS waterpipe as a superficial hydration treatment in voice production in healthy young women.

Study Design: This is a prospective, single-blind, within- and between-subject experimental design.

Methods: Thirty six female university students (mean age 24.