Kolibree toothbrush heads are easy to replace.
To change the brush head:
1. Unlock the toothbrush head by turning it anticlockwise until the two indicators are aligned;
2. Pull the toothbrush head up in order to remove it from the handle.
3. Replace it with a new toothbrush head, ensuring that the indicators are aligned.
4. Turn the toothbrush head clockwise until it is locked into place.
You can order replacement toothbrush heads at any time via the Kolibree website.