Philips Sonicare Optimal Whitening BrushSync Heads, White, Pack of 4 (Compatible with All Philips Sonicare Handles) : Amazon.co.uk: Health & Personal Care
Philips Sonicare Optimal White Standard HX6068/12 Replacement Heads For Toothbrush | notino.ie
Philips Toothbrush Heads Sonicare W2 Optimal White Standard Sonic Toothbrush Heads Black x 4 HX6064/13 - Accessories
Philips Toothbrush Heads Sonicare W2 Optimal White Standard Sonic Toothbrush Heads White x 8 HX6068/12 - Accessories