Which immunoglobulin is the MOST abundant in saliva?

Secretory IgA (sIgA) is the predominant immunoglobulin in saliva and other mucosal secretions (tears, intestinal mucus, breast milk). sIgA is produced as a dimer linked by a J-chain and transported through epithelial cells via the secretory component. It provides the first line of immune defense in the oral cavity by inhibiting pathogen adhesion to mucosal surfaces. IgG is the most abundant immunoglobulin in serum.