The Philips Sonicare Optimal White Electric Toothbrush Replacement Brush Heads achieve whiter teeth in just 1 week vs a manual toothbrush. When used with a compatible brushsync enabled sonicare toothbrush our smart brush head replacement reminder will alert you when the brush head needs replacing for effective cleaning, every time. Model number: hx6064/13. Pack of 4. Compatible with all Philips handles. Manufacturer’s 1 year guarantee. EAN: 8710103860334.