Mark. T-blue is not yet approved by the FDA for intra oral use in the USA, although it is in testing right now. It is the dye, which has been used on pathology slides for decades to differentiate squamous cell mitochondria from everything else. Only a couple of institution like UCSF are using it (at some professional risk, as it is an off label use of the product) in the oral environment, and even there, it takes a really great set of trained eyes to read the resulting intra oral stain, and make a definitive case of toludine blue positive SCC diagnosis. Having said that, I have a bottle of acetic acid (watered down vinegar) and T blue in my own home, and I routinely dye things in my own mouth that bother me. But this idea isn't for everybody, and I am not suggesting that anyone else even consider doing this. And no, I will not tell you where to get it. I would get may ass sued big time. My personal relationship with researchers has made this possible. OraTest, (oral toludine blue) which will hopefully be sold by Zila Pharma in the next few years is what you are talking about. They are currently selling it in other countries (China, England) where there are fewer, or at least laxer regulations on these kinds of things. Canada allowed its sale for a while, and then the marketer of the OraTest removed it from the market when the question of whether or not it, itself could be mutanogenic... I think not in theses small exposures, but that is the question before the FDA as well as what does it actually find, and what claims can be made for it. I am intimately involved with people who are doing the research and on this particular topic I know more than 99% of the doctors out there since I have been aggressively following it for about 5 years, and have read every scientific paper ever published on it. As a person geared toward early detection and definitive diagnosis, a dye that any idiot could put on the tissue and know right then and there what it was (SCC or not) would be a Godsend. But we do not know that without some uncertainties today. Where it excels is in defining a border of an area to be excised, so that the surgeon can stay a certain amount of tissue further away from that demarcation and not leave any inappropriate tissue behind. You will not find ENT's and oral surgeon or dentists routinely using this product in the US.