Chemical plaque control and extrinsic tooth discoloration

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Abstract
The etiology of extrinsic tooth discolorations due to chemical, plaque‐preventive agents is not fully understood. However, information from experimental investigations point to at least 3 possible mechanisms. (A) Non‐enzymatic browning reactions (Maillard reactions). (B) Formation of pigmented metal (Fe, Sn)‐sulfides. (C) Reaction products of food and beverage constituents and chemical, plaque‐preventive compounds. Available evidence indicates that browning (A) and formation of pigmented metal sulfides (B) are the most likely causes of these discolorations while dietary factors (C) may play a modifying role.