Fairywill Replacement Heads Soft and Firm for Electric Toothbrush 507 508 917
100% Compatible for Fairywill Sonic electric toothbrush（507 508 917 659）. Dentists suggest to replace toothbrush head at least every 3 months to avoid exceeding breed of bacteria. Bristle type:Soft (01 02 04)& Hard (05 06) option.