My poor little Missy Kitty has had this. The Vet told me that Siamese Cats are VERY prone to this, and he suspects that Missy has Siamese Blood in her. Her teeth got bad REALLY, REALLY FAST!!!!!!! I had them cleaned and two teeth fell out during the cleaning! I had another vet then, and I was BEYOND upset, as she almost died after the cleaning, from a secondary infection. I had ASSUMED the Vet had given her an antibiotic shot with the dental procedure.... WRONG!!! He never gave her ANYTHING!!! My POOR little Miss Missy almost died!!!!! I was new here to this website and I posted about it and the IMMEDIATE response was not to assume she got an antibiotic shot(so she may well not recover on her own, without getting a STRONG antibiotic--and SOON!!!) I got off the internet, grabbed my cat and got her into another Vet within the hour. They kept her and got her better, and now she has her teeth cleaned every 4 months. Her teeth are continueing to deteriorate, even with the close follow-up with the new Vet. He said she has "Calcium Resorption" and eventually all her little teeth will fall out, no matter what we do. BUT, we CAN keep her comfortable and try to keep the teeth she still does have, in as good a shape as possible, for as long as possible! I am STILL so, so grateful, for all the kind help the posters here, gave me, when I needed it most!!!