1. First of all, look at the edges and corners of the Japanese ys comb. The lower left corner of the authentic Japanese ys comb is more pronounced, while the lower left corner of the fake Japanese ys comb is relatively rounded.

2. Secondly, pay attention to the logo part of the product. The font color of the genuine logo is white, while the font color of the fake one is bluish.

3. Finally, take a look at the text on the warranty book. The fonts on the genuine ones are thicker, while the fonts on the fake ones are thinner.