Relish Engineering Lab Team

Sonic and ultrasonic toothbrushes sound similar, but they use different cleaning technologies. This guide explains their mechanisms, model-specific brushing techniques and practical features to compare when choosing a toothbrush. Sonic vs. ultrasonic: what do the terms mean? Ultrasound refers to…

Electric toothbrushes combine compact electronics with a carefully designed brushing mechanism. The vintage Broxodent advertisement below shows an early corded design—a useful starting point for exploring how today’s electric toothbrushes are built. The Broxodent shown here used a power cable.…