The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz (10,200 to 21,000 movements per minute), and that of a typical adult female from 165 to 255 Hz (19,800 to 30,600 movements per minute).
Električne zobne ščetke vibrirajo v smeri gor/dol ali s krožnimi gibi, včasih v kombinaciji obojega.