Philips Sonicare Optimal Whitening White BrushSync Heads (Compatible with All Philips Sonicare Handles), 8 Count (Pack of 1)

Customers find these toothbrush heads to be genuine and appreciate their whitening benefits, noticing their teeth becoming whiter over time. The bristle firmness and size receive mixed feedback - while some find them not too soft or hard and like the smaller size, others mention they feel stiff and are very small. Durability is also mixed, with some finding them long-lasting while others report them breaking quickly. The compatibility with Philips Sonicare toothbrushes is generally positive, though one customer notes issues with connection.