Bobby,
My cancer, which I was told was nothing by an ENT, was initially diagnosed with an Oral CDX Brush biopsy by my dentist. It is painless and non-invasive. There is also another non-invasive test called Vizilite which can be done by a dentist. Basically you swish with a dilute vinegar solution and are examined with a special light. Don't take "it's nothing" as your answer.
Barb