“…If streptococcal antibodies act through saliva, then IgG antibodies could participate since IgG is found in whole saliva [Brandtzaeg, 1965;Lehner et al, 1967]. How ever, both IgG and IgM can reach the teeth through crevicular fluid which contains very much larger amounts of IgG and IgM than saliva, and thus could participate in the immune response to streptococci [Brandtzaeg, 1965;H olmberg and Killander, 1971; Shillitoe and Lehner, 1972], Salivary antibodies were not measured in this investiga tion and the role of secretory antibody in caries immunity remains to be elucidated.…”