Dear User, Thanks for using health care magic. The presence of white patch in mouth known as leukoplakia which is a premalignant condition which mean they can turn to malignancy at time. I think your doctor is right in planning for his tongue biopsy. There is possibility that everything will be turn out normal after biopsy but the biopsy will tell you the exact nature of the lesion. You might be aware that early diagnosis saves life and easy to treat. There is not much pain associated with biopsy and it is just like opd procedure and dose not impair quality of life. It is quite safe and not associated with any major complication except hemorrhage. Hope I have answered your query. If you have any further questions I will be happy to help . Thanks