It is very easy to use. I did a GLO at the dentist. This is a good way to keep up with him. I don't think you need to do it professionally beforehand. It works very well, it's fast, it's portable and my teeth are whiter! People would notice, but I wear a mask all the time. But I notice and I feel better. Now it's the little things that make you feel better. I don't have sensitivity like other products or my gums are a little white.
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