A whole-body or whole-room voluminous antiviral and antibacterial airborne disinfection system is disclosed which includes a sterilization chamber, including a nozzle disposed in the sterilization chamber, a tank disposed outside the sterilization chamber, the tank is adapted to hold a photosensitizer fluid of edible food dyes, a light source within the sterilization chamber adapted to flood the sterilization chamber with light; and a nozzle adapted to release the photosensitizer fluid aerosols and generate reactive oxygen species in a fog-like dispersion.

Provided are methods of reducing and killing bacteria and fungi, and photodynamic treatment methods and sterilization methods using the methods of reducing and killing bacteria and fungi. The method of reducing and killing bacteria and fungi includes bringing a composition including a Ligularia fischeri extract or a fraction thereof as an active ingredient into contact with cells or tissues of a subject and irradiating cells or tissues of a subject in contact with the composition with an absorbable wavelength of excitation light.

Disclosed are an oral hygiene device and an oral hygiene device system, and a method of using the same. The oral hygiene device includes a housing, a battery, a control chip, a light source, and a light guide needle. Battery, control chip and light source are encapsulated in housing to form the oral hygiene device. The housing includes a connector, and light source is positioned in the center of connector. The light source is electrically connected to control chip and battery. The light guide needle is mounted on a head of the housing using a mortise-tenon structure. The light guide needle includes a mounting joint, and is in mortise-tenon connection and in interference fit with the connector through the mounting joint. The oral hygiene device has less damage to teeth or healthy tissue in the oral cavity, and has a good disinfection effect on bacteria in oral cavity.

A device includes a material and a silver titanium dioxide coating supported by the material. The material may be a face mask adapted to be worn by a user. The coating may be applied via a Silver Titanium Dioxide solution. The solution may also be atomized for inhaling. Silver Titanium Dioxide acts as a photocatalyst at least due to the Titanium Dioxide to degrade organic molecules and microorganisms. The silver acts as a Bacteria stat, Fungus stat, and a Virus stat with or without light exposure. A titanium dioxide solution may be applied to skin. Exposure of the solution imbibed skin to light may be performed to remove or reduce tattoos.

An UV-C device may include several UV-C light sources (e.g., UV-C LEDs) and such UV-C LEDs may have UV-C reflecting structures arranged to direct UV-C in a particular direction and at a particular size and shape. Doing so may, for example, increase the UV-C in a particular direction or working area. A UV-C generating device may be utilized in an air stream, such as an air duct, to sterilize air from that air stream. Sound suppression compartments may be placed around a UV-C generating device inlet and/or a device outlet to reduce sound from the UV-C generating device. Human perceivable (e.g., audible, tactile, and/or visual) notifications may be utilized to provide notification of different modes of operation and/or different efficacy levels (e.g., percent ranges of inactivation of a particular or multiple particular viruses, bacteria, spores, etc.