An oral care device comprising: a handle portion; an oral care implement coupled to the handle portion, the oral care implement comprising a brush head portion comprising brush filaments; a first electrode located in the brush head portion and operable to be in electrical contact with an oral cavity of a user; a second electrode located in the handle portion and operable to be in electrical contact with a hand of the user; a power source providing a voltage potential between the first electrode and the second electrode; a controller circuit in electrical communication with the first electrode, the second electrode, and the power source, wherein: electrical contact of the second electrode at the hand of the user and electrical contact of the first electrode at the oral cavity of the user completes an electrical circuit between the first electrode and the second electrode; the controller circuit controls a micro-current I that passes through the user between the first electrode and the second electrode, and determines an impedance of the electrical circuit based on the micro-current I; the controller circuit controls the oral care device to operate in a first operational mode when the impedance is within a first impedance range; and the controller circuit controls the oral care device to operate in a second operational mode when the impedance is within a second impedance range; hard tissue of the user, the second impedance range is indicative of a soft tissue region of the user, one or more of the additional impedance ranges is indicative of a tongue of the user, and one or more of the additional impedance ranges is indicative of a gingival margin of the user. a handle portion; an oral care implement coupled to the handle portion, the oral care implement comprising a brush head portion comprising brush filaments; a first electrode located in the brush head portion and operable to be in electrical contact with an oral cavity of a user; a second electrode located in the handle portion and operable to be in electrical contact with a hand of the user; a power source providing a voltage potential between the first electrode and the second electrode; a controller circuit in electrical communication with the first electrode, the second electrode, and the power source, wherein: electrical contact of the second electrode at the hand of the user and electrical contact of the first electrode at the oral cavity of the user completes an electrical circuit between the first electrode and the second electrode; the controller circuit controls a micro-current I that passes through the user between the first electrode and the second electrode, and determines an impedance of the electrical circuit based on the micro-current I; the controller circuit controls the oral care device to operate in a first operational mode when the impedance is within a first impedance range; and the controller circuit controls the oral care device to operate in a second operational mode when the impedance is within a second impedance range; hard tissue of the user, the second impedance range is indicative of a soft tissue region of the user, one or more of the additional impedance ranges is indicative of a tongue of the user, and one or more of the additional impedance ranges is indicative of a gingival margin of the user. electrical contact of the second electrode at the hand of the user and electrical contact of the first electrode at the oral cavity of the user completes an electrical circuit between the first electrode and the second electrode; the controller circuit controls a micro-current I that passes through the user between the first electrode and the second electrode, and determines an impedance of the electrical circuit based on the micro-current I; the controller circuit controls the oral care device to operate in a first operational mode when the impedance is within a first impedance range; and the controller circuit controls the oral care device to operate in a second operational mode when the impedance is within a second impedance range;