Gingivitis Image (Figure 24.9). Reprinted from OpenStax Microbiology (p. 989), by N. Parker, M. Shneegurt, A.-h. Thi Tu, B. M. Forester, and P. Lister, 2016, Rice University. Copyright 2016 by Rice University. https://openstax.org/books/microbiology/pages/24-2-microbial-diseases-of-the-mouth-and-oral-cavity