Which brand of hair straightener is better?

I have used Yi Siyun's hair straightener, and the effect of Yi Siyun's hair straightener is quite good. You can operate it at home by yourself. I was born with a curling iron. I often go to the hair salon to straighten my hair. It's more expensive, so I have to wait. Later, I wanted to choose a straight hair cream online and operate it at home. I was worried about the effect before buying. After all, the hair cream perm is a technical activity, and the quality must not be too bad. Finally, I watched an operation video of straight hair cream, bought it and started to operate it myself. First, after shampooing, blow the hair to 80% dryness, use agent A as softener, soften it for about 15 minutes and then rinse it off. Then apply agent B as styling agent, and the hair will be straighter after washing. If you use a splint, the effect should be better. Next time you buy a splint, pull it again.