The invention relates to a pharmaceutical composition comprising a siloxane according to general formula (I) wherein R means -C1-C6-alkyl； R1 and R2 each mean independently of one another -C1-C6-alkyl, or together form a (2n)-membered ring； and n is an integer of from 2 to 8； for use in combination with a pharmacologically active ingredient in the prophylaxis or treatment of a dental disorder.
