How is the ProtectiveClean 6100 different from the 5100?

The 6100 adds a third mode (Gum Care) and BrushSync head recognition. The 5100 has two modes and no head chip reading.

Do I need the app to use it?

No. The 6100 has no app or Bluetooth. All modes, the timer and the pressure sensor work on the brush itself.

Sonicare recommends every three months. The brush's head-wear indicator lights up when the chip in the head says it is due.

Gum Care mode runs at lower intensity, and the pressure sensor pulses if you press too hard. Users with sensitive gums often start there.

The handle, one brush head, a charging base and a travel cap. A hard travel case is not included.

It fits Sonicare click-on heads. BrushSync intensity matching only works with heads that have the chip, such as the G2, C2 and W heads.

6 stores we checked sell it, including eBay, Target, Whatnot, Mercari, Walmart.

At Whatnot, for $50.00, 61% under what the other stores charge, as of our latest check.

$50.00at WhatnotChecked 1 h ago

61% under what the other stores charge

Compared across 6 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.