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Most cats never get their teeth looked at until something already hurts. By then they've been living with sore gums or a loose tooth for months, eating less, dropping food, and hiding the discomfort the way cats do. Dental disease is probably the most common health problem vets see in cats, and also the most quietly tolerated.
The big one is periodontal disease, the slow buildup of plaque that hardens into tartar under the gumline. Left alone, it inflames the tissue, loosens teeth, and opens the door to infection. You won't see it from across the room; you'll smell it. Bad breath in a cat is rarely normal.
Then there's tooth resorption, a brutally common condition where the tooth structure literally dissolves from the inside. It's painful, it's hidden, and it often only shows up on an x-ray. A cat with a resorbing tooth may still eat, because cats are that tough, but they're not fine.
A cat in the wild that stops eating because of a sore mouth is a target. So they've evolved to keep eating through real pain, which means the owner sees a normal-looking cat right up until the vet finds three bad teeth. Don't rely on appetite as your only signal.
Brushing is the gold standard, and yes, you can teach a cat if you start slow with a finger brush and a pet toothpaste. For most households that's unrealistic daily, so be honest about it: do it when you can, and lean on the other tools.
Dental treats and prescription diets formulated to reduce plaque help some. Water additives are hit or miss. None of these replace a proper cleaning, but they slow the slide.
A real dental cleaning needs anesthesia, which sounds scary and is actually routine and far safer than letting disease advance. The vet scales under the gumline, x-rays the roots, and pulls what can't be saved. Most cats come home brighter, eating better, and acting years younger within a day or two.
If your cat's breath makes you step back, or if he suddenly favors one side of his mouth, don't wait. A dental check is quick, and it spares him a lot of quiet pain you'd never otherwise know about.