My STEAM project shows the difference between healthy gums and teeth vs. teeth and gums with periodontal (gum) disease. When examining these models of teeth on the left side you can tell that the gums are discolored with yellow which resembles plaque build-up. In addition to redness that shows sores and bleeding. And black resembles dead gum tissue. Some of the teeth also are chipped, cracked, or missing they are also discolored due to plaque buildup. While on the right side shows a model of pretty healthy normal teeth and gums. The gums are nice and pink with no abnormalities and the teeth are white with no plaque build-up.