I am a nut when it comes to trying to get my teeth white. I got so far getting my teeth white and they just would not get any whiter. I talked to my dentist about it and he told me that my enamel was weak. And the more enamel I lost the less white my teeth would get. With just one tube of this toothpaste with liquid calcium my teeth are showing improvement. They look whiter and even feel stronger. I am so glad to have found this toothpaste because my dentist even tells me my teeth look better. I have not had a cavaty or any teeth problems when I have started to use this toothpaste. It has a great mint taste that leaves your mouth feeling clean all day. It really does feel different the normal toothpaste. It just makes my teeth feel stronger and cleaner and better then it ever did with any other toothpaste I have tryed using in the past. This toothpaste clams that it is for stronger, healthier and whiter teeth and I truly feel that they are right. My teeth do feel stronger and healthier. Plus they look whiter then they did when I first started using it. I would so say if you want to keep your enamel strong or help it get stronger use this toothpaste. Its a great product and at a great price.