Hi Jason, welcome to the OCF. While you wait for the biopsy reports, which unfortunately I anticipate to be positive. White patch has stayed too long without healing, even though it may still be a precancerous leision or dysplasia. Ventral tongue is the high risk area of developing squamous cell cancer.

Yes, Toluidine Blue is used for cancer screening and seems to be reliable test but again it is not a conclusive test and that is why the biopsy.

I wish to be wronged with the biopsy coming to be negative. Take good care and all the best.