Cats do groom by licking, but this is not the same as a full bath or professional grooming. Licking removes some dirt, but it cannot remove grease, odor, mats, or tangles. Cats also cannot trim their nails or brush out mats, and most cats’ teeth aren’t brushed regularly—meaning bacteria and debris can accumulate. Regular professional grooming helps prevent health issues, hairballs, and excessive dander, which can worsen allergies. Long-haired cats are especially prone to getting litter, urine, or feces stuck in their fur, which can be uncomfortable for them and messy for your home.