Which of the following is NOT a Major Unusual Incident?

The correct answer is D. Dental injury.

A Major Unusual Incident (MUI) typically involves significant incidents that affect the health or safety of individuals, such as verbal abuse, neglect, or arrest, which are all serious concerns. A dental injury, while it can be concerning, does not usually rise to the level of a Major Unusual Incident unless it is part of a broader situation involving neglect or abuse.