I bought five sets of clean and affordable promotional toothbrushes produced by Jiangsu San Xiao Group Co., Ltd. in Shaoxing Wal-Mart. I bought it at first because it was cheap (only five sets were sold in 7.8 yuan), but after using it, I found that the soft bristles were very hard. After brushing my teeth with this toothbrush, my teeth bled for a week or two and my gums were slightly painful. I thought there was something wrong at first, because the bristles of the new toothbrush were hard, so I didn't pay attention. Who knows? ! ! It's really cheap and no good goods! ! !