Mark's Daily Apple makes mention of chew sticks on a blog post regarding dental health. It's only a couple paragraphs but there are some hyperlinks in there as well.

http://www.marksdailyapple.com/how-to-take-care-of-your-teeth/

I use the Thursday Plantation sticks. I like the cinnamon more than the tea tree oil, but I usually chew on the them after I eat lunch. The minty tea tree sticks come in handy when I'm getting sleepy.

Country hicks just grab a piece of straw and chaw on that!