This is for example if you die of old age, or of a desease that makes you really weak and your body can not enter the Death Realm anymore.
If I remember correctly - not exactly.
Upon your death your body is taken care of by the Dark Crystal. Basically, it attempts to repair any damage that has been done in the last moments of your life. It skips, however, any damage that has been done long before the moment of your death. Therefore scars, lost limbs, etc. aren't taken care of by the Dark Crystal.
Now further problem stemming from this is that the Dark Crystal cannot possibly repair results of long-term illnesses. Diseases, starvation, aging and other sources of slow body damage escape possibilities of the Dark Crystal.
DC also doesn't seem to be able to reconstruct bodies that have been completely annihilated. At least it couldn't reconstruct bodies destroyed by the Azure Sun, or a larger pack of beasts (see main website).