Cats suffer from calculus and gingivitis for a long time. The main reason is that the owner did not do a good job in protecting the cat's teeth. Actually, it's not that difficult to protect a cat's teeth.
First, eat cat food with special shapes.
If you are a family that feeds soft food, you should change the food to cat food. Cat food has a unique particle shape, and some big brands have even introduced cat food to remove dental calculus. The shape of cat food helps cats clean their teeth when chewing and remove dental plaque by friction, so try to let cats use dry cat food as their daily staple food.
Second, let cats get into the habit of checking their mouths and brushing their teeth.
There are toothpaste and toothbrushes specially for cats in pet shops. Cats must not use human toothpaste and toothbrush. Cat toothpaste is harmless if swallowed by cats. Green tea ointment can make cats have fresh breath and healthy teeth. A special toothbrush for cats can be placed on the fingers of the owner.
Third, salt water and tea can also clean cat teeth.
If you can't buy a special toothbrush or toothpaste for cats, or if cats haven't used toothpaste that is very resistant to toothbrushes, there is also a gentle and acceptable way to clean cats' teeth: wrap medical gauze around their fingers, and gently wipe their teeth with tea or light salt water, especially to clean the upper molars. The friction of gauze can also easily remove tartar.
Fourth, serious dental calculus needs to go to the pet hospital to wash teeth.
If the cat has replaced serious dental calculus, it is necessary to take the cat to a regular pet hospital for tooth cleaning. Note that cats also need anesthetics to wash their teeth, so they should fast and water first to prevent vomiting and choking themselves in a coma.