Not going down well

Cats are hair-tearingly contrary. After our last vet's visit, we bought a pack of Hill's Prescription Diet T/D Feline Dental Health so that Momo could clean her grungy teeth while she eats her meals. At first, she wouldn't touch  the stuff, though Maui and Kaiser who have no teeth problems went for their new diet with no trouble. Eventually, hunger got the better of  Momo and she too ate. Hours later, she threw up everything. Silly girl ate without chewing, the precise action of which would have cleaned her teeth. I give up. Anyone want a slightly used bag of dental care kibble?