Was just thinking about this while taking a boring regular shower with water. A sonic shower just vibrates at high intensity to pulverize dirt and knock it from your body; but what about oils and lipids and all that other stuff that makes you stinky?
On a side note, I realized that the only time any dental care is brought up, it’s with the ferengi. The race with quite possibly the worst teeth in the galaxy are the only ones seen using cleaning utensils on them.
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.