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One
Unlock
Turn the toothbrush head counter clockwise until the two indicators are aligned.
Two
Pull
Pull the toothbrush head up in order to remove it from the handle.
Three
Replace
Replace it with the new refill head, making sure that the indicators are aligned.
Four
Lock
Turn the toothbrush head clockwise until it’s locked into place.
Five
Smile!
Your refill head is now ready to use on your smart electric toothbrush.