1. Intuitively, most of the colors on the street stalls are ugly and the smell is pungent. However, the brand's products are made step by step based on color analysis and ingredient analysis. 2. Some brands of nail polish have patented ingredients. For example, za has a patent for quick drying. When I apply it on two fingers, the first nail polish is already dry. The rose scent of Anna Sui will last until it falls off after applying it. 3. There is a fundamental difference in the quality of the brushes between the two brands. The brushes of the brand have clear roots, good elasticity, and are easy to spread evenly. The quality of the brush plays a decisive role in the smearing effect of counterfeit products. 4. The brand's brush will be thinner, easier to color, and less likely to fade. 5. Personal experience: Even if the color on the stall is very attractive, it is best to apply a layer of brand base polish to protect the nails. After the nails are painted, lick them with your tongue. Unscented nail polish is less harmful. Some small brands They don't specialize in nail polish, and the coloring effect may not be much different from those sold on street stalls