Purchased Biomin C toothpaste after a search for a toothpaste to rebuild my tooth enamel and whiten my teeth. I was surprised to have found Biomin toothpaste. From childhood I have had white spots on my front teeth and noticed also that after using Charcoal toothpaste it had left black spots on the corners of my bottom teeth. Best to read the negative side effects of Charcoal toothpaste. I’m in my 50’s and after using the toothpaste for near 2 months, my teeth are actually feeling much smoother, thicker and whiter. I can’t see the white spots anymore and a stain that I had on one of my teeth has lightened. It does take time but must be patient as you do begin to see results. Found before and after photos from other Biomin customers. The significant difference between this toothpaste compared to a whitening toothpaste is that Biomin builds enamel whereas whitening toothpaste has abrasives that get rid of the stain but weaken the enamel at the same time. The Biomin toothpaste is great for getting rid of sensitivity too as it permanently plugs the natural holes in the enamel to create a barrier and thus the enamel gets stronger and harder. It’s like having new enamel and new enamel is white. I’m feeling much more confident in the strength of my teeth and that I have a whiter brighter smile. This toothpaste is different; you have to read the science and technology behind it; very interesting. Also, how you use the toothpaste is different; you brush and spit out, no rinsing. I normally brush with the toothpaste and rinse then do a second brush, swirl as per instructions then spit out. I experienced no side effects at all. Cost wise is a little more expensive but really it is worthwhile if you want to keep your teeth! I’m happy and will continue to use it. Easy purchase online, customer service is great and delivery is very quick. Fiona