I was cleaning my drivetrain and noticed that on my big chainwheel, two or three non-consecutive teeth are slightly shorter than the others. They don't seem broken (as in snapped), just smoothly worn out.

I don't seem to have any problems with shifting, or with teeth skipping. Should I be concerned? (I'd just need to replace that chainwheel, correct?)

See-
https://www.bikeforums.net/bicycle-me...s-alright.html

Single speeds can still use full height tooth profiles.

but you would be in the C&V range to have a bike with a derailleur drive train

without the early shifting tooth reshaping.

Normal and intentional.

Thank you! That's exactly what I needed to know!