[Secretary IgA and the oral cavity: general review]

The authors present a synthesis of the knowledge concerning the nature and origin of secretory IGA as well as its main components (J chain and secretory component) in the oral cavity. This IgA is the main mediator of humoral immunity and is the most frequently identified immunoglobulin in saliva. Its role in the protection of mucosae as well as in the anti-caries immunity is presented.