People waste their time and money with this garbage. I'm not saying its bad, but there's much better stuff out there. If you care about re-enamelization which everyone with bad to average teeth should, get some Prevident Rinse. Its prescription, its made by Colgate and it has a generic version also. There is also a prevident toothpaste.
Use the mouthwash once a week and you're good. If your dentist doesn't tell you about it and you don't have great teeth, its ONLY because they want to make more money off of you.