Which of the following is NOT a recognized oral manifestation or association of diabetes mellitus?

Diabetes is associated with impaired healing, not improved healing. Diabetic patients have reduced neutrophil function, microvascular disease, and altered collagen metabolism — all of which worsen periodontal outcomes. Parotid hypertrophy (bilateral, painless sialadenosis) and hyposalivation/xerostomia ARE recognized associations with diabetes. Poorly controlled DM also increases caries risk due to elevated glucose in saliva.