I've been wondering this for a while.
How did people keep their teeth clean before the invention of conventional tooth brushes and tooth paste?
In ancient drawings, people were depicted as having white teeth like today, so how did they do it?
What if the verdict of guilty was wrong?
Many people who were believed guilty have since been released from prison.
Dead people can't be released.
However on the other hand there is the argument of overcrowding in prisons. If it is 100% sure they are guilty then maybe death could be used.?