Our products are formulated with scientists at UPM and tested by dentists - designed to help remove stains on the SURFACE of teeth (EXTRINSIC staining). Over a year of RDA lab-tests were done on various types of teeth to ensure that our formulation has the right ratio of ingredients (especially charcoal) that could remove the stubborn stains on the surface of our teeth without harming the enamel and results were evident.All of our products contain Charcoal and VCO which are the key ingredients for brightening/whitening and detoxing.The unique combo of the two main ingredients – Bamboo Charcoal and Virgin Coconut Oil - binds with rough parts on our teeth, usually surface stains and plaque, making it easier to remove the tough yellow substances. Once the charcoal has been given enough time to stick to our teeth, it can be removed and takes the plaque, food particles and surface stains with it.This is how it succeeds in it removing tough stains on teeth effectively. It polishes teeth, removes stain without harming the enamel and cleans mouth leaving it feeling extra fresh and clean.Your teeth will gradually start to regain it’s original brighter and whiter shade once the tough stains are removed bit by bitIMPORTANT INFO:Since all of our products contain only natural ingredients, in general it does take longer to see results even when used diligently as compared to a product with chemical/bleaching ingredients in it. What our paste does is it helps remove these tough stains on the surface of our teeth gradually and make teeth look brighter.Most of us are born with natural yellow teeth, so our teeth will still look yellowish (and not necessarily bleached-looking white) but much brighter as the unnecessary tough stains on the surface of teeth are gradually removed making our teeth look naturally brighter and feel cleaner.Our human bodies are very different from each other and our teeth enamel is also different from each other. Some people have stains that can be easily removed and some people have much tougher & stubborn stains from years of accumulation on the surface of teeth.That is why some of our customers start seeing results just after a few days of brushing their teeth with our Natural Tooth Polish while others take much longer (like months) to see results because their stains are much thicker and harder to remove. You can see the different result timelines here: https://www.chacology.com/pages/results The best way to see results is to take a “before-use” photo (in natural light) and “after-daily-use” photo about 2 weeks later. This is a much more effective way to see the difference tooth-by-tooth.