Electric Toothbrush Waterproof Inspection Checklist
As we all know, electric toothbrushes must have certain waterproof ability, and waterproof ability is also an important indicator to determine their service life. According to the national standards, the electric toothbrush waterproof inspection can be divided into different grades. Generally, the waterproof performance of electric toothbrushes should meet the requirements of IP66, IP67 or