Pregnancy, parity and periodontal disease. 
Many women believe that their dental condition deteriorated during pregnancy or as a result of having children.  Epidemiological studies have reported an association between higher parity and tooth loss, and higher parity and periodontal attachment loss.  Several possible explanations for this association exist.  First, hormonal changes during pregnancy affect the immune response to bacterial plaque and drive vascular and gingival changes that may contribute to heightened gingival inflammation.  These changes are transient, without irreversible loss of periodontal attachment, and post-partum resolution can be expected for most women.  For women with destructive periodontal disease, the effects of pregnancy and parity are unclear.  Second, it is also plausible that parity and socioeconomic position (SEP) have shared risk factors, increasing the incidence of disease or influencing its management.  Education, one aspect of SEP, is an important determining factor for women's fertility rate, with a gradient of fewer children with higher educational attainment.  Higher levels of education are also favourably associated with behaviours conducive to oral health, and a lower incidence of damaging health behaviours.  Thus, the potential for confounding is considerable.  This review examines the literature on the association between pregnancy, parity and periodontal health, and explores sociobehavioural mechanisms for the observed association.