Possible Clues:

• It's famous for doing the floss
• Seller of Glide dental floss
• Maker of some replacement heads
• Sonicare alternative
• Maker of iO electric toothbrushes
• Brand whose 'B' stands for 'brush'
• Brand by a bathroom sink
• Big name in electric toothbrushes
• Electric toothbrush brand
• Glide floss brand