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For promotion of good oral hygiene, including the reduction of dental plaque and gingivitis.

Sonicare® Advance Model 4900 consists of three primary parts: brush head, power handle, and charger base. Central to the brush head are the resonator arm and the torsion bar. The brush head's bristles are mounted in a bristle plate on one end of the arm, two magnets are mounted on the other, and the torsion bar is perpendicular in the middle. A 261-Hz oscillating magnetic flux generated inside the power handle forces the magnets into motion, which then causes the resonator arm to oscillate about the torsion bar. The torsion bar, magnets and bristle plate have a resonant frequency close to the 261-Hz driving frequency, and this enables the system to produce a desired amplitude effect. The bristles vibrate in the direction perpendicular to the bristles' length and nominally perpendicular to the brush's axis. The oscillating magnetic flux is generated by a stator coil in the power handle, in close proximity to the attachment of the brush head. The flux is controlled by solid-state electronics and powered from two nickel-cadmium rechargeable batteries elsewhere within the handle. Energy for recharging the batteries is transferred from the charger base through a system of induction coils within the power handle and the charger base. Maximum power dissipation by the handle is 3 W. The charger base runs on standard North American 120 V, 60 Hz power. Internal electronics convert the input power to a 65 kHz output signal for more efficient transfer of power to the handle.