I am a 50 year old female, 5'2" at a 140 pounds. I just noticed on the front, bottom gums of my teeth, there are a couple of brownish lines going straight down starting on the gum line between the teeth. I do have a history of bladder cancer in which I am not sure this would have any effect, but just thought I would mention it. Without seeing the problem, do you feel it could be cancerous? Thank you for your time. Alice