A first aspect of the invention provides a device for monitoring the health of a person, comprising: a frame configured to be worn within the mouth of the person； a microphone, mounted to or within the frame, for measuring sound data； and an accelerometer, mounted to or within the frame, for measuring acceleration data； wherein the sound data is for determining breathing data relating to the person's breathing and the acceleration data is for determining impact data relating to an impact experienced by the person.
