There are three different types of Sonicare brush heads. The brush head that fits your toothbrush depends on the model you own.
The click-on brush head is the standard brush head and fits most of our Sonicare rechargeable toothbrushes.
The screw-on brush head is compatible with the old Sonicare Essence models.
The Philips One brush head is only compatible with the Philips One.