Fairywill Sonic Rechargeable Electric Replacement Toothbrush Soft Brush Head USB
For Fairywill FW-507 FW-508 FW-659 FW-917 FW-507-420. Dentists suggest to replace toothbrush head at least every 3 months to avoid exceeding breed of bacteria. Compatible models of toothbrush. Install : Slide toothbrush head down to the handle.