Usmile electric toothbrush: advantages: 1. It lasts for a long time, and it has been used for more than 2 months and has not been charged. 2. There are three brushing modes: clean, shiny and caring, and it has its own memory function. What mode did you use last time and what mode will you open next time? 3. The bristles are soft, and there has been no gum bleeding. Disadvantages: 1 There will still be a place to charge. 2. The body is a little fat, so it is more appropriate to hold it with a big hand. Fortunately, it's not very heavy, it's a little slippery. Haha Aiyou electric toothbrush: Advantages: 1. There are five modes, gentle, clean, sensitive, gum care, polishing and whitening, which I like very much. Adapt with tenderness first, then clean, and occasionally whiten, which is very humanized. 2. The bristles are moderately hard, too soft to brush cleanly, and the boyfriend's long-term cigarette stains have actually eased a lot. 3. The noise is very small and fierce. The one I used before was very noisy and my ears were uncomfortable. Disadvantages; 1. Once charged, the battery life is about 3 days, which is not as long as that of usmile, but it is actually ok and normal. In terms of appearance, I personally prefer Aiyou, simple and atmospheric! You'll feel better.