Abstract: A device for preventing bruxism includes a carrier (1) which is intended for receiving in a mouth of a user and which includes at least a part of an electronic bio-feedback system. The bio-feedback system includes at least one signal sensor (2) which is sensitive to electrical muscle signals and which is coupled to a control unit. The control unit is designed and adapted to generate a correcting stimulus via an electrode (2) when a muscle signal is detected above a predetermined threshold level. The bio-feedback system is herein provided with elements for individually adjusting and storing the threshold level.