After cats have oral ulcers, pet owners need to: First, clean the mouth: Pet owners should pay attention to cleaning the cat's oral hygiene frequently to avoid residual food from breeding bacteria in the mouth after eating; second, supplement dietary nutrition: Oral ulcers It has a lot to do with the lack of nutrition in cats, so pet owners should supplement cats with various required nutrients in a timely manner; third, supplement vitamin B: lack of vitamin B can also cause oral ulcers, so pet owners should specifically supplement cats with vitamins in a rationed manner. B; Fourth, drink more water: Oral ulcers in cats are most likely caused by internal heat. On weekdays, cats do not like to drink water, and chewing dry and hard food (bones, cat food, etc.) for a long time can easily cause internal heat and lead to oral ulcers.