I’ve not actually tried a modern sonic shower so I’ll take your word for the limitations of them as things stand and guess they’ve figured out how to make them work effectively in the next few hundred years.
I think the Ferengi we see have excellent teeth, by Ferengi standards. you can see they’ve working hard to look after them, rather than trying to look like hoomans.
Slugs have evolved multiple times from snails, due to calcium poverty, dividing off into separate species when they couldn’t get the resources for shells