Alan Bell mentioned in his book that Bill Owen wore dentures, so I've speculated that he had several pair for when he played different kinds of characters.
I've seen people come into hospital with their teeth stuck together with sticky tape and glue to hold them together.
Loctie super glue is a firm favourite I have noticed, for mending teeth, not sure how good for you that is though.
Compo's teeth seem to change over the series to which ones are bad,sometimes they all look okay,I will try and capture pictures of the changes when I have time