Final answer:
Elastic ligature ties in orthodontic treatments should be removed using pliers, which are the professional standard for this task in order to remove them safely and efficiently.
Step-by-step explanation:
Elastic ligature ties are commonly used in orthodontic treatments to attach the archwire to the brackets on a patient's teeth. When it comes to removing these ties, the correct tool should ensure safety and efficiency without damaging the orthodontic appliances or causing discomfort to the patient. The right instrument for this task is pliers, specifically designed for orthodontic use. Dental floss might be used in some cases for ligature removal, but it is not the professional standard for removing elastic ties. A scalapel and a toothbrush are inappropriate tools for this application and could cause harm to the patient or damage the braces. Therefore, the correct answer is A) Pliers.