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.
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.
Things you can chew... 17 Answers