Guardian+ Oral Device with Patent-Pending Blue & Red/NIR Light for Teeth Whitening & Oral HealthThe Guardian+ is the very first oral device of its kind, with patent pending technology that implements BOTH blue light & red NIR light so you can safely whiten your teeth while also receiving the benefits of red light therapy! The Guardian+ is designed to provide the most consistent coverage of light in the mouth by incorporating the blue light LEDs in the top row & red NIR (NIR = near infrared) light LEDs in the bottom row (see pictures above). This