Systems for determining brushing parameters in an electric toothbrush

A brush head for an electric toothbrush, comprising:

• bristles extending from a base structure;
• and
• an array of tufts, each tuft formed as a separate group of the bristles bundled together;
• a sensor assembly configured to generate, for each of the tufts, a signal representative of a force applied to each of the tufts;
• and
• a controller configured to generate a tuft signature representing a distribution of the force applied across the array of tufts, wherein the tuft signature includes a plurality of training tuft signatures and a current tuft signature, wherein the controller is configured to create, during a training process, a signature map associating each of the training tuft signatures to particular locations in a user's mouth, and wherein the controller is configured to determine, during use, a location of the brush head in the user's mouth by comparing the current tuft signature to the signature map.