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Has your cat ever been tested for FeLV or FIV?
Severe gingivitis is young cats can occur with the immune deficiency viruses. You probably need to invest the $ for a test...because if you are dealing with that, the outcome is much different.
There are cats that are extremely sensitive to the bacteria on their teeth. Cleanings are not long lasting enough to get any longer term benefit. Low dose antibiotics, oral gels, foam, rinses, and dental foods help. There is a new product on the market that coats the teeth to protect them ...much like a sealant.
I have had some cats need low doses of steroids to control the discomfort..and some owners end up having all the teeth removed to lessen the pain of gingivitis. Sounds extreme...but a toothless healthy gummed animal eats better than at cat with teeth and severe gingivitis.
Hope this helps.