Final answer:
Use a soft-bristled toothbrush and gentle flossing technique.
Step-by-step explanation:
An important patient education point for a patient with a low platelet count is to use a soft-bristled toothbrush and gentle flossing technique (option B). This is because low platelet count can lead to easy bruising and bleeding, and using a soft-bristled toothbrush and gentle flossing technique can help minimize the risk of injuring the gums and causing bleeding.
Options A, C, and D are not the most suitable choices because they either suggest avoiding dental floss altogether or do not provide specific guidance on oral hygiene measures for a patient with a low platelet count.