The best tutorial for repairing Sonicare toothbrushes is here:
Repairing your Sonicare
The problem is either a corroded circuit board or worn-out Ni-Cad batteries. Both repair solutions require soldering, but full repair is possible.
The best electric toothbrushes are the Oral-b Professional Care and the
Phillip Sonicare Diamond Clean. You can find more information on these electric
toothbrushes on their respected websites: http://www.usa.philips.com/c/diamondclean/289711/cat/en/ and http://www.oralb.com/products/professional-care-smart-series-4000/.
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