I'm from Argentina. We drink mate all the time. I never heard of (or experienced) teeth pigmentation issues caused by Yerba Mate. (yeah, I know it's a data poin

I'm from Argentina. We drink mate all the time. I never heard of (or experienced) teeth pigmentation issues caused by Yerba Mate. (yeah, I know it's a data point of one, but given the popularity and tradition of mate in the region, I think I'll hear about it if it's a common issue). Assuming you are in the US. I notice that US products containing Yerba Mate (like tea bags or drinks) are heavily industrialized and have many other things besides Mate. I'll not discard the possibility of a problem caused by combining Yerba Mate with other chemicals. Other than that is not different from coffee: drinking too much coffee without proper dental hygiene also affects teeth pigmentation.