Toothbrush for oral cavity position detection

An electric toothbrush handle for providing oral cavity position detection during operation, the handle comprising:

• a handle body having a longitudinal axis L;
• a receiver body extending from the handle body along said longitudinal axis L, wherein the receiver body has:
• an engaging portion distal the handle body and configured to removably engage a replaceable toothbrush head;
• and
• a base portion opposing the engaging portion, wherein the base portion adjoins the handle body;
• an electric motor contained in the handle body;
• a drive shaft operatively connected to the electric motor and extending along the longitudinal axis L from the motor and at least partially into the receiver body;
• wherein the receiver body is elastically deformable relative to said longitudinal axis L;
• and
• a three-axis force sensor operatively connected to the base portion and configured to obtain three-axis force data for oral cavity position detection during operation, wherein the three-axis force data comprises (a) lateral bending forces in at least one of an x-axis direction and a y-axis direction caused by elastic deformation of the receiver body and (b) traction or compression forces along the longitudinal axis, wherein the x-axis and y-axis directions are perpendicular to each other and to the longitudinal axis.