Here are some tips that may help your cat’s dental calculus fall off on its own:

Dietary adjustment: Provide rich Fiber foods help keep teeth clean.

Oral cleaning: You can use special cat oral cleaning products, such as oral spray or tooth cleaning water.

Dry brushing: Use gauze or a soft toothbrush to gently scrub your cat's teeth.

Cat toothpaste: Use special cat toothpaste and brush your cat’s teeth regularly.

Chew toys: Provide some chewing toys to help clean teeth.

The role of water: Ensure that cats have sufficient water intake to help keep their mouth moist.

Regular examination: Check the cat’s mouth regularly to detect problems in time.