My Sonicare toothbrush makes a loud noise when I turn it on. What should I do?

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My Sonicare toothbrush makes a loud noise when I turn it on. What should I do?

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Be sure to remove the clear plastic travel cap from the brush head before turning on your Sonicare toothbrush. Also, make sure the cuff that secures the brush head to the handle is tightened completely.