Other outdated yet still routine dental practices include polishing of teeth during checkups for any justification other than cosmetic reasons
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In my experience they always find something that they "have time to take care of right now if you want". I've heard anecdotes of folks going to get second opinions that reaches a different conclusion.
The root canal was eight years ago. I brush and floss twice a day (brushing without flossing feels weird to me now). I haven't been to the dentist since before the pandemic and my teeth feel completely fine.