Repair guides and support for battery-powered toothbrushes.

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making humming noise and not working

oral triumph professional 9000 electric toothbrush fully charged making humming sound and not working

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@myyetti , Isaac , First try another new original Oral B brush head to ensure it is not a faulty head. You may have to dismantle the tooth brush and clean around the small drive gear. Link #2, 3rd picture in step 4 of guide shows the small drive gear that may need cleaned, put back in position or replaced if worn. link #1 is a video showing disassembly of your Oral B. Good luck.

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https://www.youtube.com/watch?v=PBYXM11d...

Braun Oral-B Professional Care 9900 Triumph Ni-MH battery Replacement

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