The cat's very sticky saliva may be caused by stomatitis. You can supplement the cat with vitamin B, and then feed it some light food. Observe it for a few days to see if it gets better. If not, it is best to take the cat to the pet store. Hospital examination and treatment to avoid delaying the condition. Pay attention to your cat’s oral hygiene at ordinary times, and do not give your cat random food to avoid food residues in the mouth, breeding bacteria and causing inflammation.