“…( 22) Patel and colleagues showed that the developing of periodontitis was higher in patients with blood group B and O and those who are Rh positive . (23) However, Francis et al, reported a no significant relation was found between ABO , Rh factor and periodontal diseases (24). In 1 -1 1977 to 2016, using ABO blood groups, dental health, risk factors, gingivitis, periodontitis and Rhesus factor as searching terms and he found a difference according to geographical diversity.…”