To be a dentist, I am thinking you need very good fine motor skills to work in a small area. Working in the mouth is a small area. You probably would want good skills with working by looking in a mirror. Sometimes the dentist will put that round small mirror inside of the mouth and work from that. That could be tricky to get the hang of.
A waiter/waitress can be a challenge to keep up with orders. It is good to be able to be aware of customers needs. Example- when people need a drink refill, if people are done eating they may be anxious to get the bill so they can leave. Waiters/waitresses also must be patient with people. Some people can be mean and even though a waiter/waitress wants to get mad and say something back, they cannot do this. They must keep it together and be nice and professional to a rude or mean customer. That can be a challenge.
A librarian is a person who probably knows the dewey decimal system very good. Usually a librarian is orderly. They need to them books back in the order they are suppose to go. They need to know in what order books go by looking at the numbers on the sides.
A soldier in Iraq is a person who is very brave. A person who probably misses a family at home. This person is also someone who is in decent physical shape to be able to run and do all the things that they are trained to do. This person is good at following orders.
A hair stylist is a person who, like the waiter, is working with customers. Anytime you work with customers you must be nice. A hair stylist also cuts hair at angles often, So a few math skills, minor geometry, could be good. Also, being able to clean up after each customer to have a nice clean area for the next customer.