Ive heard about this too. It does indeed work, but it feels weird and it will not change as dramatically as the picture shows. Also, it will be atleast a solid month til you can even notice a slight difference

Well, I am pretty sure that you'd have to do it over an extended period of time... it isn't magic! people talking all that ish!

I have tried this and it does work but not as quickly as they show in the picture. You have to keep doing it and I didn't really like the way it felt on my teeth. If you don't have the money to whiten your teeth cosmetically then go for it.

Magnesium and manganese are used to harden steel and as alloying elements in mild steel with low carbon content to much can make you sick honestly great bs fact kinda like esting pork is bad for you!