A method (500) for calibrating a pressure sensor (28) of an oral cleaning device (10). The method comprises the steps of: providing an oral cleaning device comprising a body portion (12), an elongated member (14, 720) extending from the body portion and comprising a head (16, 770), a pressure sensor (28) configured to obtain a measurement of a force applied to the head by the user during a cleaning session, and a processor (32) configured to receive, from the pressure sensor, the measurement of force applied to the head； obtaining a non-zero load calibration parameter； and calibrating, by the processor using the non-zero load calibration parameter, the measurement of force received from the pressure sensor.
