> I had a lot of success switching a cat to a wet diet. It cleared up many health issues for her. Dry food is their junk food.

Her is the keyword here.

Castrated male cats (cats are almost always castrated here) generally get FLUTD.

We got a special diet for him.

And we CBA with separating them for food. That's just not practical.

So, she'll also eat his diet food.

We occasionally give them some different food like our leftover herring. But that is very salty for them. Its a treat, but not healthy.

what about their teeth ? I've heard, at least for dogs, that the crunchy dry food helps keep their teeth healthy

thats an old wives tale. And if my cats teeth are any indication, a dry diet didn't prevent any problems

Granted, there's no proof that wet is better, there's just a ton of anecdotal evidence that dry food leads to dehydration and kidney issues. I had to switch entirely to wet due to diabetes. Surprisingly, fancy feast classic is one of the most recommended foods.

Take them in for their regular vet visits.