I have taken the tooth waxing class but not the denture class. The tooth waxing technique sounded like a recommended course for the denture class according to the instructor and the TA's, although it's probably not an official requirement.
There was a timed final for the tooth-waxing class when I took it, and only the people who passed the final were awarded certificates (and there were about 1/4 who didn't pass... which sort of surprised me cuz I thought they'd let everyone pass). If it was the same for the denture class, I don't know if it would be hard for one to start with the denture class, assuming other students have already learned tooth waxing before.
I don't think the certificate was the point for taking these classes, though. And apparently, these few days of classes wouldn't really make much of a difference in our professional skills/knowledge in the future (I mean Dr. Hunt's teaching was very decent, but the class was simply too short). I believe that these classes serve to allow us get a gist of what it is like to be in the pre-clinical labs once we are in d-school. Maybe there are pre-dents who thought they wanna be dentists but wouldn't realize they hate doing work with their hands until they take these classes 🙄 . For such purpose, I say taking just one of these classes would be sufficient. I personally picked tooth waxing because the time fitted my schedule better.
This course would probably also strengthen one's dental school application a bit, because I was asked about this experience at multiple interviews. Additionally, I think Dr. hunt used to write letters for people who take and pass these classes.
Envision, if you have done other activities related to manual dexterity and you know you'll like dentistry, maybe it's not necessary for you to take it. You already got in 😉. If I were you I'd take the money to travel instead. You are gonna learn those things soon enough in dental school. But if you are really bored and don't knwo how to spend your money, taking one of these classes would still be fun.