Amazon.com : Toothbrush Replacement Heads Compatible with Braun Oral-B Electric Toothbrushes, 4pcs, Refills for Oral B Type 3756 3757 3744 3765 4729 4731 4739 : Health & Household
Amazon.com : Replacement Brush Heads Compatible with Braun Oral-B Electric Toothbrushes, 8pcs, Polishing Cup Whiten Your Teeth, Refills for Oral B Type 3756 3757 3744 3765 4729 4731 4739 : Health & Household
How do I know which Oral-B electric toothbrush I have?