Since using Zen Principle whitening powder my natural teeth are much whiter and my crown is hardly noticeable just like when I was younger
I am always pleasantly surprised when a product actually does what their marketing says it will and this product is one of them! I have a crown on one of my top front teeth that I got when I was 17; I am 60 now.  Over time my crown has stayed white (because it is porcelain) while my natural teeth have yellowed somewhat.  Since using Zen Principle whitening powder my natural teeth are much whiter and my crown is hardly noticeable just like when I was younger!  It is also very soothing on my gums :) It did take about 3 days of use before I saw the full effects but this product is wonderful!
Rating: 5 stars