Final answer:
During a clonic-tonic seizure, the dental hygienist should not insert a tongue blade but should remove any items from Lindsey's mouth, move her to the floor if possible, and tilt her head to the side.
Step-by-step explanation:
If Lindsey T., a 12 year old middle school student, experiences a clonic-tonic seizure, the dental hygienist should take specific actions to ensure her safety. Firstly, inserting a tongue blade into the patient's mouth is not recommended as it could cause injury. Instead, removing any items from her mouth is a critical step to prevent aspiration. Furthermore, while obtaining a thorough medical history can be beneficial, it is not a priority during an active seizure. Instead, moving Lindsey to the floor if possible, to prevent her from falling and injuring herself, and tilting her head to the side can help to manage her airway and prevent the inhalation of secretions. Consequently, the correct actions for the dental hygienist to take would be options B, C, and D.