The effect is average. Our child has been treated 10 times before and after, and it is still obvious. Only laser treatment, it seems to be 585 wavelength, which is more expensive. If you haven't been treated before, you can try it. If the treatment once or twice has no obvious effect, I suggest you don't insist, and the effect will get worse and worse. Moreover, if it is not recommended to pay a one-time fee, it is better to pay it at one time. It's purely personal advice. I hope I can help you.