These dental sticks take much longer for my dog to chew than any other brand. They do a better job than cheaper chewier versions which are gone in a couple of minutes. My dog spends a good 10 minutes or so gnawing on one. I consider they do a good job and help keep teeth clean along with regular brushing.
Buying theses “in bulk” makes sense - they work out much cheaper than buying in single packs in the supermarket and, having two dogs, it make’s economical sense. My dogs love them - they have one each a day as a treat and, hopefully, their teeth will benefit!