Plasibo effect ?

Carbon coco is a highly advertised product claiming to be an all natural teeth whitener. After reading countless reviews I decided to try to myself... I personally believe that it is a plasibo. I compared the crest whiting toothpaste to the carbon coco and let’s just say the crest did a better job. I feel like the coco has a good job of taking the surface stain out, but being an advid tea and coffee drinker myself, this product just didn’t work... after 2 weeks for trying it there was no change :(