Death doesn't last, but any non-fatal injuries you get will. They'll heal at whatever rate is normal for your age and species. Fortunately, despite the Admiral's fondness for 21st century Earth, we aren't limited to 21st century medical technology here. [Or you can kill yourself to reset your body to its pre-injury state, like Narvin did. He doesn't add that, though, as that's generally considered a bit of a Bad Idea.]