Quick answer: A deshedding tool has fine, closely spaced teeth that reach through the top coat to remove loose undercoat fur — the type that causes hairballs and ends up on your furniture.
Regular brushes work on the surface coat. Deshedding tools reach deeper to pull out the dead undercoat before it's shed naturally. Used weekly, they can reduce shedding by 50-90% in heavy shedders and significantly reduce the frequency of hairballs.
Deshedding tools work best on double-coated cats — most domestic shorthairs, Persians, Maine Coons, Ragdolls. For very short single-coat cats or hairless breeds, a rubber grooming glove is more appropriate and comfortable.
Once or twice a week is sufficient. Always brush in the direction of hair growth with gentle pressure — the tool is effective without force. More frequent use can irritate the skin or damage the coat. Introduce gradually with treats for cats that resist grooming.
A deshedding tool is one of the highest-impact grooming investments for heavy-shedding cats. Used weekly, it makes a visible difference to household fur and hairball frequency within a few weeks.