It cleans. Ultrasonic waves at 45,000 Hz create microscopic bubbles in the water that form and collapse against every surface of whatever you put in — including the grooves and undercuts a toothbrush bristle physically can't enter. Five minutes, no scrubbing.

No. It's a cleaner, not a steriliser, and we don't market it as one. It removes plaque, film, staining and debris. Be sceptical of anything in this category claiming otherwise.

Once a day is the routine. More isn't better — repeated ultrasonic cleaning over time can leave microscopic scratching that makes clear appliances look cloudy.

No. Room temperature only. Heat combined with vibration is what warps thermoplastic trays, and a replacement retainer is expensive.

Five minutes on the standard setting. There's also a ten-minute deep clean with pulsed ultrasonic, an ultrasonic-only mode for delicate items, and a UV-only mode.