US prisons are used more and more for manufacturing. You know about license plates, but private companies also contract for prison labor to make some of the things you use every day.

The companies who employ prison labour for making dentures and other dental appliances are members of the National Association of Dental Laboratories, so they must have their workers properly trained to do the job. This may actually give a skill that could be used on the outside and keep prisoners from re-offending.

That's just one of the items on the list of Everyday Things You Didn't Know Are Made in Prisons. Link