A short wavelength visible light-emitting toothbrush with an electronic interlock control device preventing operation when the toothbrush is removed from the user's mouth. The electronic interlock control over operation is necessary to prevent accidental eye exposure to the high intensity light source with a wavelength in the range of 400 nm to 500 nm. The light-emitting toothbrush activates upon entering the user's mouth but deactivates immediately when removed, thus protecting the user's eyes from direct exposure to the high power light source contained in the brush head.

A personal care guidance system for guiding a user through a personal care routine, the system including a personal care implement having a section at least partially made from a magnetic and/or ferromagnetic material, and a magnetic personal care guide to which the personal care implement is magnetically attachable and detachable. The magnetic personal care guide includes a guidance tool, the guidance tool being activated by detaching the personal care implement from the magnetic personal care guide.

The exemplary embodiments disclose an apparatus, a system and method, and a computer program product for removing dental plaque. The exemplary embodiments may include emitting light, detecting reflections of the light, analyzing the reflected light, and determining an amount or location of dental plaque based on the reflected light.