Waterpik Aquarius WP-660 vs Philips Sonicare ProtectiveClean 6100

Philips Sonicare ProtectiveClean 6100 wins — These products are not direct competitors — Waterpik replaces flossing, Sonicare replaces a manual toothbrush

Scores: Waterpik Aquarius WP-660 9/10 · Philips Sonicare ProtectiveClean 6100 9/10

These products are not direct competitors — Waterpik replaces flossing, Sonicare replaces a manual toothbrush. The ideal oral hygiene setup includes both: Sonicare for superior plaque removal on tooth surfaces and Waterpik for interproximal cleaning. If forced to choose one to add, Waterpik adds more incremental benefit if you're already brushing adequately. Sonicare is more impactful if you're...

Waterpik Aquarius WP-660 lists at $89 while Philips Sonicare ProtectiveClean 6100 lists at $99 — Waterpik Aquarius WP-660 undercuts Philips Sonicare ProtectiveClean 6100 by $10 (11%).

Spec-by-spec comparison

Waterpik Aquarius WP-660Philips Sonicare ProtectiveClean 6100
mechanismPulsating water jet — 1200 pulses/minuteSonic vibration — 31,000 brush strokes per minute
pressure10 settings, 10-100 PSI—
reservoir22 oz, removable—
tips7 tips included—
ada_acceptedYes—
modesFloss mode + Hydro Pulse massage modeClean, White+, Gum Care modes

Waterpik Aquarius WP-660

What works

  • ADA-accepted clinical evidence shows 51% more effective at reducing gingivitis vs string floss
  • Water jet reaches below the gumline and between teeth in areas string floss physically can't penetrate
  • Ortho tip and pocket tip expand functionality to braces, bridges, and periodontal pockets

What doesn't

  • Not a replacement for brushing — works best as an addition to a brushing routine, not a substitute
  • 22 oz reservoir requires counter space and regular mineral deposit cleaning
  • Splash back can occur at high pressure settings for new users

Philips Sonicare ProtectiveClean 6100

What works

  • 31,000 sonic strokes/minute physically removes plaque from tooth surfaces more effectively than manual brushing
  • Pressure sensor alerts when you're pressing too hard — reduces gum recession risk from overbrushing
  • Gum Care mode provides 3-minute gentle massage cycle for gum health improvement

What doesn't

  • Cannot replace flossing — sonic brushing cleans surfaces but doesn't reach interproximal (between-tooth) contact points
  • Replacement brush heads at $25-35 per head every 3 months add ongoing costs
  • 14-day battery requires periodic charging — more maintenance than a manual toothbrush

Bottom line

Our pick: Philips Sonicare ProtectiveClean 6100. It edges out the alternative on 31,000 sonic strokes/minute physically removes plaque from tooth surfaces more effectively than manual brushing. That said, Waterpik Aquarius WP-660 still wins on ada-accepted clinical evidence shows 51% more effective at reducing gingivitis vs string floss — consider it if that single trade matters most for your use.

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