Here’s a solution in search of a problem. Is there one person - ONE PERSON - in the history of the world that has been harmed in any way because he did not sanitize his unshared toothbrush?
I bought 2 of these last year. I didn’t give it much thought, but after about 6 months I looked inside. It was black with mold. It might kill germs, but it breeds mildew. It was disgusting. I tossed them out.
Note that they say that bacteria can grow on your toothbrush, and that good oral health contributes to overall health, but they do not claim that reducing the bacteria on a toothbrush is a benefit to oral health. They don’t make the claim because they can’t.
According to the ADA there is no evidence that anything beyond rinsing your toothbrush with water and allowing it to air dry provides any health benefit.
So, yes, it will kill some germs on your toothbrush, which is fine if that helps you sleep better at night, but it isn’t going to make you a healthier person or reduce health risks.