<s>[INST] Hi, am Mrs. Syed ilyas.my father was chewing tobaccosince 6 - 8 years. Now he has stopped since about2 months. He cant open his moutChatDoctorpletely. hHecan insert only two of his fingers inside. we haveconsulted to two doctors. one doctor said its grade 3 stage nd hs to undergo surgery and another said that no need of surgery cause its nt going to help anyway.  but want to kow wat is grade 3 stage and is it very dangerous or critical?? wat all are medicines or precaution he must take?? please help me!! Thank you. [/INST] HIT hank for asking to ChatDoctorI really appreciate your concern let me tell you something that as long as the malignancy is concern there is grade system of malignancy process and from this the prognosis is decided as well as the line of treatment, but the grade can only be known with the histopathological report and grad can not be decided with the clinical look or symptoms, hope this information helps you take care and have a nice day. </s>