The complete guide
What the kHz number on an ultrasonic cleaner actually means for you
Every listing in this category leads with a frequency figure — 43, 45, 46, 48 or 49kHz — and it's tempting to assume higher is simply better. In practice, the differences within that 43-49kHz band are marginal for dental-appliance cleaning: higher frequencies produce smaller, gentler cavitation bubbles suited to delicate items, while lower frequencies in the range produce slightly more aggressive cleaning action. For a retainer or night guard, any cleaner in this band works effectively; tank size, mode selection and build quality (like a detachable tank or active cooling) matter more day to day than chasing the highest kHz number on the box.