It's common for a person to never feel about what they drink and how it is affecting their dental.
Most vets recommend brushing a cat's teeth once 1 week. The yellow stain attacks enamel and lessens the beauty of your oral. Otherwise, why would people include it with toothpaste and water? http://kwba.or.kr/bbs/board.php?bo_table=menu0406&wr_id=317060