Additive, use as limited (16/day max) treats
I agree with a previous reviewer - these are addictive as other, non-dental-care, Whiskas treats, to use them as a training aid and that if you leave them unguarded or let your cat too close to the packet then your cat will very probably want to eat the lot in one go (note: recommended feeding is up to 16 per day and adjust main food to allow for these). I'm not sure how effective these will be for our cat as he tends to gobble his food whole and hasn't got all his teeth to chew or bite.