@cinnamon215 here's a few that may help...

Autoimmune Diseases and Oral Health: 30-Year Follow-Up of a Swedish Cohort
-- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5872203/

Autoimmune Conditions and Oral Health
-- https://www.hss.edu/conditions_autoimmune-conditions-and-oral-health.asp

Role of Autoimmune Responses in Periodontal Disease
-- https://www.hindawi.com/journals/ad/2014/596824/

ARE BLEEDING GUMS THE FIRST SIGN OF AUTO-IMMUNITY?
-- https://terrywahls.com/are-bleeding-gums-the-first-sign-of-auto-immunity/