Also consider that in "Olden Tymes" (TM) people generally lost their teeth quite early on. Those teeth that remained were not always the nicest to look upon.
George Washington was particularly known to have very bad teeth. In the civil war, the requirement for being a soldier was that you have two good front teeth to bite the paper casing off the bullet cartridge.
I believe that the main reason teeth have been omitted is that they were not attractive.
That said, I prefer a not to paint teeth where possible. You generally get a much more interesting subject when they smile but don't show teeth.
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