Worn bristles are the silent killer of electric-brush performance: after about three months, cleaning efficiency drops sharply no matter how good the motor is. The D-D pack gives you two dentist-designed oval heads — six months of proper cleaning per pack.
The oval shape is noticeably easier to position on back molars than the large paddle heads on some competitors, and the fade-indicator bristles tell you exactly when a swap is due. If you own a DX-1, put these on a repeat order and forget about it.
Transparency note: ONOSONIC WHITE TEETH Expert® is our sister brand — Oral Care Guide UAE and ONOSONIC share the same publisher. We apply the same testing criteria to our own products as to every other brand, and we flag this relationship on every ONOSONIC review so you can weigh it for yourself.