Teeth improved quickly after switch from wet food
Our two-year-old cat had been on a diet of Bozita until very recently. Although I've no doubt it's a high-quality food, plaque began to build up and there were black marks on his gums, which caused us some concern. On switching to this product recently, there has been some improvement already.
Although he always ate the Bozita without problems, the cat is much more enthusiastic about this food, to the point of whining constantly for the two hours prior to a mealtime (the only annoying downside of the switch). If you switch your cat from a wet food to these Hill's biscuits, they will feel hungrier for a while due to lack of moisture in the food, and have to learn to drink a lot more water to compensate. About a month or so after the switch, he does seem less ravenous than he was at first. (And yes, we've been carefully feeding him the correct amount for a cat of his weight.)
Value for money is pretty good, especially in the larger bags. If your cat is anything like ours, it's worth using the Trixie 'board game' (search on Zooplus) to slow down the rate of eating somewhat.