If you got money go for it; if not, you can probably find something better for the price!
I do notice a difference and I've only used it twice. However, you have to do 8 minutes 4 times to complete 1 treatment. It literally takes more than a half an hour to complete. Also, it says it's safe to swallow the solution, but it taste so gross and makes me nauseous when I swallow it. And I did get tooth pain on the first treatment during the 3rd round. However, it was quick and didn't linger like the others would. Overall, I think it's OK, but I don't think it is worth it for the price point. Therefore, if you got money, then go for it. If not, you can probably find something better!
Rating: 3 stars