When dealing with a semiconscious patient whose dentures have loosened, what is the appropriate action?

In the case of a semiconscious patient with loosened dentures, removing the dentures is the appropriate action to ensure that the airway remains clear. Loose dentures can obstruct the airway, particularly in patients who are not fully conscious. By removing them, you reduce the risk of airway blockage, which is critical in any patient management situation, particularly in those with altered consciousness.

Ensuring a clear airway is a priority in emergency medical situations. If the dentures are left in place and the patient loses more consciousness or the ability to maintain their airway, there's an increased risk of obstruction. Therefore, the practical and safe approach is to remove the dentures to help maintain a patent airway for the patient, allowing for proper ventilation and further assessment.

Other options would not effectively address the immediate concern of potential airway obstruction caused by the dentures being loose.