Hi,
Funny that you refer to the teeth as the other subject for which you would like to find out why it is important that things are A1OK.
The most obvious thing is that both the hernia and the teeth if not OK can cause pain.
However have you considered the consequences of decompression when flying and more in particular the result of a rapid decompressio nwill have on any cavity which has trapped air in it.
Teeth with decay and or leaking fillings can have trapped air under them. And your bowel obviously has air in it. When you get exposed to a sudden drop in ambient pressure that air will expand and in the case of the teeth give you sudden and excruciating pain. And the same will happen to any hernia which has popped outside the abdominal cavity.
Now you will say that this is not a likely scenario for the average PPLer but your class 2 will give you the opportunity to fly the sort of machines which make these issues worthwhile considerations.
FD