I'm seeing this post later than I'd like to, but your kitty sounds fairly healthy given their age.
My little (large) - she's ~5.2KG Mia has similar things - she's overweight for her size, has had a cyst drained a few times on her belly, but it otherwise healthy.
With regards to the arthritic stuff in the cat, there's an injection that can be given to them (3 rounds a few weeks apart, then 6 monthly thereafter) which helps with the joints. Its something that is in human trials now, and it works, she's like a new cat everytime she gets a shot of that juice (whatever it is).
She's coming up 12-14 years (we're not entirely sure, as we adopted her when she was assumed to be 6 - and have had her for about 8 years now) - and now that it is getting cold at night, she's become the annual winter snuggle muffin, and its just adorable.
Have you tried adding some water the wet food in addition to the jelly that comes in the can / pouch / however you fed them? This increases their fluid intake which can help with the erosion of any kidney stones / issues etc.
Edit:
Also all the best for your human mouth, hope it isn't painful
I only posted it a few hours ago lol, not bad timing!
I did ask to confirm that he does not yet have arthritis, just worn down which I guess are two different things. That being said she did mention these injections, but I'm of the mindset of being the least invasive as possible until necessary given his age. Going to the vet is very very stressful for him and doing that so often isn't a good life. That being said, the second he shows any actual discomfort, even a slight limp, I'll take it to that next level. So far his only symptom is an inability to jump more than shin height.
That's a very manly thing to say haha. But yeah Smash is similar. He just slept next to me in bed all night (Don't tell my wife, she's visiting parents and I'm not supposed to let him up!)
(I'm aware this evidence will be on the blockchain forever. If it ever comes to it, it was a complete joke and he's never been on the bed)
This is what I'm doing now as well as putting these fish oil supplements in. Annoyingly he has decided the food is therefore invalid so I'm gonna have to hide it better. I know cats get pickier as they get older but damn he's always been like this. He's never even been interested in human quality food, real tuna, chicken.
30 more minutes before my departure to dentist doom... 20 years never knowing how bad it is. Dread to think
Sounds like a fussy boi.
He'll learn
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