DEAR DR. ROACH: I'm interested in consuming dimethylsulfoxide (DMSO). I've read it will destroy the root of cancer and hasten the healing of broken bones, ligaments and strained muscles. My question is whether it is OK to consume the suggested amount of DMSO?

My aortic valve was replaced with a mechanical valve three years ago. After 12 months of follow-up exams, I was informed that the valve had sealed perfectly and was told to enjoy life. -- W.H.