The reason LED lights are used for teeth whitening is to speed up the process of breaking down the solution. Active Whitening bypasses the need for a LED light because the two solutions that begin breaking down to whiten teeth are separated in the Dual Barrel Syringe, so they only start reacting with one another through the Patented Mix Tip at release. This means the solution is at its strongest and most "active" state, resulting in a bright smile in less time, without the hassle of having to use a LED light.
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