Does anyone know if you need more schooling to be a dental hygienist for an orthodontic doctor? Do they get paid better in orthodontics than they do in normal dentistry?

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This question is worth 10 points. =)
I went to an orthodontist’s office (getting Invisalign clear braces). They took impressions using some plastic trays (one was too big and they used another smaller set). They also took pictures of inside of my mouth. To help with the pictures, they used several pieces of plastic tools. One in particular is used to keep your tongue down or out of the way when taking pictures (looks like a small plastic spatula), another set of two is used to stretch the mouth (goes inside the mouth and has handles that stay outside to pull). They also used a mirror (put inside the mouth) 3″X4″ to take pictures, etc.
Q: How are all these plastic tools and the mirror sterilized? I am sure the mirror isn’t for one time use only.
Q: How about the rest of the plastic pieces? Are they reusable?
Q: Aren’t the technicians suppose to wear gloves when conducting this work?
Thank you very much for your time and answers.

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