"""Product Details

Our most popular size brush head.

Its 8 rows of extra-soft bristles clean deeply but gently.

Sonicare brush head delivers 62,000 brush strokes in each 2-minute brushing.

A worn-out brush head can compromise the effectiveness of your Sonicare toothbrush.

Fits the Advance handles ONLY (4000 Series)."""

American Dental Association

The American Dental Association (ADA) recommends you replace your toothbrush every three months and after every illness.