i brush my teeth but finally find it is no useful

In fact I found that the brush can not clean the teeth very well, especially for the gaps. So after bushing teeth, I also use the waterpick and it works like the waxpick but it takes advantage of the water and I feel it can really clean my teeth well. I prefer to buy products to take good care of my teeth rather than spending expensive cost to go to see the dentist. I love China

I've heard that the reason for grey teeth is taking Tonics and syrups in our childhood. And there is nothing to worry about. I've heard that Amway's tooth paste (Glister) has some polishing agent in it. May be it can help you improve your condition little. However, since the cause is from the root, you may find little improvement and not a complete one. I've also seen promotions for some tooth paints (white). I don't know how far they are healthy.

okay,got it.then I can tell you a way to avoid others noticing your teeth which you think is not good,that is when you talk to others just open your mouth a little and when you smile just close your mouth to make others ignore it.