Mouthpiece for an oral care device

A mouthpiece comprising:

• a mount configured to be gripped between upper and lower jaws of a subject;
• one or more mouth contacting elements, each being configured to contact one or more parts of the mouth of the subject and treat and/or clean the contacted one or more parts of the mouth when the mount is gripped between the upper and lower jaws;
• and
• a sensing arrangement positioned in or on the mount, wherein the sensing arrangement is configured to sense, during gripping of the mount by the upper and lower jaws of the subject, one or more measurements of mechanical properties of the gripping by the upper and lower jaws,
• wherein the one or more measurements of the mechanical properties are responsive to one or more abnormalities or physiological dysfunction in masticatory apparatus of the subject,
• wherein the sensing arrangement comprises:
• a first sensor configured to sense a force or pressure applied between a first side of the upper jaw and a first side of the lower jaw;
• and
• a second sensor configured to sense a force or pressure applied between a second side of the upper jaw and a second side of the lower jaw, wherein the first side of the upper jaw is opposite to the second side of the upper jaw and the first side of the lower jaw is opposite to the second side of the lower jaw,
• wherein the sensing arrangement is configured to generate a difference measurement, being a difference between the force or pressure generated by the first sensor and the force or pressure generated by the second sensor,
• wherein the sensing arrangement comprises a torque sensing arrangement configured to sense a torque applied to the lower jaw as the upper and lower jaws grip the mouthpiece.