I made some relative

I made some relative measurement between the hand pieces and brushes. An accelerometer was located mid brush-head behind the brush. These are no-load measurements (other than the mass of the accelerometer and mounting block) so they do not simulate brushing pressure. They also don't assess the different bristle designs.

Essence+ = 0 dB (set as baseline), fundamental frequency = 270 Hz (32,400 strokes / min)
Original handle with currently available brush head = +5 dB (1.9 times stronger), Fundamental = 260 Hz (31,200 strokes / min)
Original handle with original A-Series brush head = +7.3 dB (2.5 stronger than Essence+), Fundamental = 260 Hz (31,200 strokes / min)
HealthyWhite+ = +10 dB (3.2 times stronger than Essence+), Fundamental = 260 Hz (31,200 strokes / min)

Notes:
- A-series brush total length is shorter than current brushes.
- HealthyWhite only examined at full power
- Harmonic content not quantified but it appeared similar between configurations

My guess is the Essence+ that I had was defective and not necessarily designed to be that weak. The slight frequency shift might also be indicative of an issue.

If I was doing this "for real" the brush would have been modified (sanded flat, tri-axial accelerometers epoxy mounted) and a simulated brush force applied. Would be interesting to measure the signal transmitted through the bristles to a simulated tooth!

I've been using the HealthyWhite+ for about a week. The AdaptiveClean brush head feels significantly stronger than the SimplyClean brush, buts its big. With a manual toothbrush I like smaller brush heads but it doesn't seem to be a problem with it on the Sonicare. I have not yet tried the DiamondClean brush that came with the HealthyWhite+.

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