Restate
I think the two better reasons for not painting teeth are not about difficulty. A broad smile is a contraction of muscles - very hard to hold if one is working from life. So, the answer is photos? Well, if the work bespeaks of being made from a photo, that is NOT the answer. I think paintings that look like real people are better than those that look like real photos.
If you did a painting of a man about halfway up a chin-up bar it would be hard to look at - the viewer would know his muscles are contracting and the moment is very fleeting... so with broad smiles.
Sargent and Hals did smirks nicely.
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