The toothbrush head features a hollow center and curved surface. Air is pressurized at the base and accelerated through the hollow, using the Coanda effect to redirect flow. This generates dense micro-bubbles during brushing, which penetrate tooth gaps and burst, efficiently removing stains with kinetic energy.
Pressurized bubbles gain resilience and elasticity to penetrate tight spaces, such as gaps between teeth. When they burst upon contact, the release of energy disrupts plaque, stains, and debris.