Charlotte has always sucked her fingers so I can't say I have noticed a difference.
It isn't inconceivable though that things are moving in their mouths - their adult teeth will be starting to grown soon and it isn't that long until their baby teeth fall out, so maybe it is uncomfortable.
I don't have any wisdom teeth, but my DH has occasional trouble with his moving. It often pushes out his fillings as they move so much.
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