A pressure feedback system continuously monitors the level of pressure or force on a brush head and is programmed to provide a feedback signal to a user based on the amount of pressure. The pressure level is monitored as a function of the change in the speed of the drive shaft. The system includes a housing, a motor, a drive shaft for attachment to a brush head, a feedback device, a sensor capable of detecting a change in the rotational speed of the drive shaft, and a microprocessor. The microprocessor is programmed activate the feedback device as a function of the measured change in rotational speed. The sensor may be a Hall effect sensor, or another sensor that is responsive to a magnetic field. A magnet may be positioned on the drive shaft, or another portion of the system that moves as a function of the drive shaft.

Systems and methods for measuring and indicating brush head life are disclosed. In one embodiment, the system includes a brush head that moves with respect to a brush handle; an energy harvester that generates electrical signals based on movements of the brush head; a controller in electrical communication with the energy harvester; and an indicator in electrical communication with the controller. The indicator is energized based on a signal from the controller.

End effectors and systems including end effectors configured to provide audible and/or haptic indicia of fatigue failure of springs disposed in the end effectors are described.

An oral care device (10) assesses a health parameter of gingival tissue of a user by means of a force-generating module (52) to apply a momentary force to the gingival tissue by applying a burst of compressed air or a burst of liquid to the gingival tissue, a sensor (28) to obtain a plurality of optical signals from the gingival tissue over time after the momentary force has been applied, a controller (30) to quantify, based at least in part on an analysis of the plurality of optical signals, the health parameter (e.g. inflammation of the gingival tissue), wherein the health parameter is based at least in part on an amount of time the gingival tissue takes to recover to the application of force; and a feedback module (46) to provide information to the user regarding the quantified health parameter.

A device for providing an indication of brushing activity of a toothbrush comprises an accelerometer configured to produce acceleration data from motion of the toothbrush, and components for filtering the acceleration data to produce gravitational components and filtering the acceleration data to produce linear acceleration components. The device further comprises a component for projecting the gravitational components and the linear acceleration components into an n-dimensional space, where and for performing a clustering process on the projections of gravitational components and linear acceleration components into n-dimensional space to produce clustering results. The clustering results comprise a plurality of clusters each of which represents a brushing area. A brushing area can be determined based on an assignment of subsequent gravitational components and linear acceleration components of acceleration data to a particular cluster, and feedback provided to a user based on the determination of brushing area, thereby providing indication of brushing activity.

A toothbrush comprising a drive mechanism and electronic circuitry configured to drive the drive mechanism to execute toothbrushing motions is disclosed. The electronic circuitry comprises a drive circuitry and a controller which is configured to form a drive signal to operate the drive circuitry to generate drive current. The drive signal comprises a plurality of signal packets, wherein a signal packet has a signal packet duration and comprises a train of switching signals. The switching signals are configured to repeatedly switch on and switch off drive current supply to the drive mechanism at a switching frequency f.sub.s. The signal packet duration is configured to define a rhythm of toothbrushing motions.

An oral health management system based on artificial intelligence image recognition to adjust the electric toothbrush includes an intelligent electric toothbrush and a server. The intelligent electric toothbrush has an image acquisition unit, an image judgment unit, a first communication unit, a positioning unit, a main control unit, a motor drive unit and a voice playback unit. The server has a recognition unit, a second communication unit and a parameter determination unit. The parameter determination unit is set on the intelligent electric toothbrush or server to determine the corresponding teeth cleaning parameters for different oral areas based on the recognition results. The system obtains a user's oral image and performs recognition and analysis, and then selects tooth cleaning parameters based on the recognition and analysis results to provide targeted oral cleaning services for the user.

Methods and devices for detecting scrubbing motion during use of a personal hygiene device are provided wherein false scrubbing feedback is eliminated. A method (500) may include receiving (502) motion information data of the personal hygiene device from an inertial measurement unit located within the personal hygiene device, monitoring (504) scrubbing motion data of the personal hygiene device along a first axis, monitoring (506) rotation motion data of the personal hygiene device for excessive rotation around a second axis and a third axis of the personal hygiene device, rejecting (508) a scrubbing detection when excessive rotation is detected, and providing (510) a user operating the personal hygiene device with scrubbing feedback in response to a determination that the motion information data are within predefined parameters of a targeted motion of the personal hygiene device, wherein false scrubbing feedback is eliminated from the scrubbing feedback.

An oral treatment device includes a head for use in treating an oral cavity of a user, an inertial measurement unit, IMU, configured to generate signals dependent on position and/or movement of the head relative to the oral cavity, and intraoral image sensor equipment configured to generate image data representing at least a portion of the oral cavity. The oral treatment device includes a controller configured to process the generated signals and the generated image data using a trained classification algorithm to determine an intraoral location of the head of the oral treatment device. The controller is configured to control the oral treatment device to perform an action based on the determined intraoral location.

A sensing module of tooth brushing motion is disclosed. The sensing module comprises a motion sensor and a display. The motion sensor detects the tooth brushing motion of a user and transmits a motion signal to the display. The display visualizes the tooth brushing motion and guides the tooth brushing motion for the user by playing a video or an audio. The motion sensor connects to the first magnetic unit of the display detachably by a second magnetic unit. The motion sensor transmits the motion signal to the display through a wireless radio frequency antenna, and the display receives the motion signal by a wireless radio frequency receiver.