I think if you were ok with what the ENT told you and didnt mind waiting 6 months to get rechecked you wouldnt have posted here. I agree!!! Experienced physicians can give you an educated guess as to what a lesion probably is but without a biopsy they cant be 100% certain. If you dont feel comfortable with the ENT who examined you then go for a second opinion. A second opinion is always a good idea, it sure cant hurt in your situation.
Leukoplakia does NOT always turn into cancer. Ive seen many patients come thru here with leukoplakia that it has never turned into cancer. If its removed, it often returns to the same area. Heres a link with more info about leukoplakia and other mouth lesions.
Hopefully whatever you have is not cancer!!! Good luck!!!
Main OCF site... Premalignant and other lesions