Nope. Used cotton gauze, unbleached cotton balls, hemp wick, but never dental cotton. It might provide "the bite" you are looking for with your eliquid
I did a bit of Googling on that back then and as far as I can tell there is no problem with it in the amount that we would get from a bit of cotton in an atty.
Now, that's my take on what I read and how I feel about it, but as always, your mileage may vary.