3. Place the stages of gum disease in order of severity. Necrotizing ulcerative gingivitis (trench mouth)
Gingivitis
Periodontitis

Gingivitis, Periodontitis, and Necrotizing ulcerative gingivitis.

Explanation:

Gingivitis - gums are mildly inflamed, may appear red or swollen and may bleed during brushing. Periodontitis - gums begin to separate and recede from the teeth. This allows plaque to move toward the roots, supporting fibers and bone. Necrotizing Ulcerative Gingivitis - supporting fibers, bone is destroyed and necrosis of the gum and surrounding tissue is seen.

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.