Oral and dental hygiene and cleaning agents for reducing re-staining of teeth

An oral and dental hygiene and cleaning agent, including, based on its weight,

• a) 0.001 to 5% by weight of copolymer(s), comprising at least one structural unit of formula (A1) and at least one structural unit of formula (A2)
• where
• R1 stands for a (C1 to C18) alkyl group,
• R2 stands for a (C1 to C6) alkyl group,
• M stands for a hydrogen atom or an equivalent of a mono- or polyvalent cation;
• b) 0.001 to 5% by weight of polymer(s) from the group comprising chitosan and chitosan derivatives,
• c) 1 to 20% by weight of precipitated silicic acid(s) with a specific surface of ≦60 m2/g according to ISO 5794-1, Annex D.