What should never be placed in the mouth of a patient experiencing a seizure?

In a patient experiencing a seizure, placing any object in the mouth can be extremely dangerous. It can lead to oral or dental injuries, as well as the risk of causing airway obstruction. During a seizure, the person may be biting down forcefully or could inadvertently choke on the object, which may exacerbate their condition or cause additional harm. Emergency guidelines universally recommend not placing items in the mouth during a seizure to prevent these risks, emphasizing the importance of ensuring the patient's safety without introducing further hazards.

Other options may seem plausible but still carry risks. Food items can lead to choking, tongue depressors could potentially break and harm the patient, and ice cubes pose a choking hazard as well. Thus, avoiding any object in the mouth is the safest approach during a seizure.