Marrying cousins would make your jaws narrower (smaller width-wise), even the famed Hapsburg royal family during Holy Roman Empire has Mannerism paintings of them (and their disproportionate jaws).
I just let my wisdom teeth grow in and it seems to have worked fine. I was told that they were impacted.
Extracting wisdom teeth "just in case they'll become troublesome later" is a US money making scheme.
Elsewhere, the risk of complications is evaluated more moderately.