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sonicare 4100 toothbrush
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Philips Sonicare ProtectiveClean 4100 Plaque Control

$29.95  
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Amazon has the Philips Sonicare ProtectiveClean 4100 Plaque Control Electric Toothbrush on sale for $29.95 (be sure to clip the $10 Coupon).  This is the cheapest we've ever seen this toothrush, which retails regularly for $69.99.  So big savings on this toothbrush of over 40%, plus great reviews on Amazon (4 Stars)

Features include a built-in pressure sensor which lets you know if you're brushing too hard, the QuadPacer, which lets you know when to shift to clean different parts of your mouth and the Smarttimer which ensures that you brush your teeth for the recommended 2 minutes.  If you're still using a normal tooth brush, I highly recommend switching to one of these...your dentist will thank you later.