With the improvement of living standards, the industry is developing rapidly. Because of its mature technology, the replacement rate of electric toothbrushes for traditional toothbrushes is getting higher and higher, its market scale is huge, and the competition is becoming more and more fierce. The more mature the industry, the higher the requirements for design. How to design products that satisfy consumers based on the three levels of rationality, sensibility, and human nature is an eternal topic for designers.