Abstract: An instrumented comb, including bristles protruding from the handle, the bristles spaced apart from each other such that a first set of two or more bristles are spaced by a first distance, a second set of two or more bristles are spaced by a second distance, and a third set of two or more bristles are spaced by a third distance, wherein the third distance is greater than the second distance and the second distance is greater than the first distance. The comb includes a controller receiving signals from: a contact sensor to detect contact with a scalp, and a magnetic compass to determine location on the scalp. The comb uses the signals to record the detected contact information and determined location information as the comb undergoes a brushing gesture over a scalp, measure hair density based on the contact information and location information, and output the measured hair density.

Abstract: A system is provided that includes a hair dryer; a hairbrush; and a client device. The hairbrush is configured to sense a characteristic of at least one of the user's hair and the hair dryer, and to transmit information back to the hair dryer based on the sensed characteristic, and the client device is configured to communicate with the hair dryer and provide feedback to the user regarding a user's usage of at least one of the hair dryer and hairbrush based at least in part on sensed characteristic captured by the hairbrush.

Abstract: A system is provided that includes a hair dryer and a hairbrush. The hairbrush is configured to sense a characteristic of at least one of the user's hair and the hair dryer, and to transmit information back to the hair dryer based on the sensed characteristic. The hair dryer is configured to update at least one setting, which may include least one of temperature control, air flow speed, and air flow shape at the hair dryer, based on the received sensed characteristic.

Abstract: A system that includes a styling tool configured to treat or shape a user's hair; and a client device configured to communicate with the styling tool and provide feedback to the user regarding a user's usage of the styling tool based at least in part on measured data captured by the styling tool. The styling tool may be a hairbrush that includes circuitry and/or sensors configured to detect one or more of sound, acceleration, force, rotation, hair humidity, and ambient temperature and humidity.