For FlexCare+, FlexCare, Healthy White, PowerUp, PowerUp Battery, Sonicare for Kids, 2 Series and 3 Series: Align the brush head so the bristles face the front of the handle. Firmly press the brush head down on the metal shaft until it stops.
For Essence, CleanCare and Xtreme products: Align the front of the brush head with the front of the toothbrush handle. Screw the brush head nut clockwise until it is firmly tightened. If the brush head rattles during use, tighten the nut further.
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