I've been keeping the Nylabone company in biz for the last few years. Found out yesterday from the vet that my bigger dog has a cracked tooth. Picked up a couple of these. My smaller dog had hers gone in ~half hour. Gotta find something with a lifespan somewhere between a half hour and six months. At nearly $6 a pop, these are not gonna work. Still cheaper than an end table. Gonna have to get real bones.