Other outdated yet still routine dental practices include polishing of teeth during checkups for any justification other than cosmetic reasons
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Routine wisdom teeth removal is not a thing in most of Europe. Another random example are colonoscopies and routine flu vaccines (except for the elderly).
Presumably flu shots are good business for the manufacturers, though I'm not sure about the science. After having the flu as a healthy late-twenty-something a while ago, which was...intensely horrible, I've chosen to get it ever since.