Hi there, I started drinking Horsetail herb tea about 3 weeks ago cause it's supposed to be good for bones. I noticed a huge improvement in two front teeth. They had previously looked almost see through and dark due to lot's of lemons. I was amazed when they started filling in. It's the only thing I've done different. There is some good info out there regarding Horsetail and how it helps bones, teeth, collagen, ect.