Hi, I am writing this for my dad. He has developed a sore in his mouth, which won't go away. There is a swelling in his lips and gums. They are velvety red in color and it usually bleeds when he brushes his teeth. He says that he feels numb in those areas and has got a feeling that something is caught in the back of his throat. He finds it difficult to chew and swallow food. His voice has changed and has become more hoarse. He has got the habit of smoking cigar and he drinks alcohol occasionally. His aunt passed away last year due to oral cancer and she had similar symptoms. So, I am worried. I am planning to take him to our family dentist ( http://www.appletondental.ca/our-team/meet-the-dentists/ ) in Ajax for a full extra-oral and intra-oral examination including oral cancer examination. Is he suffering from oral cancer? Can this be cured? How is oral cancer treated? What is the probability of success of this treatment?