The most direct and effective way is to pull out nails.
Pull out the whole nail plate of the deformed nail and let it grow back
It is now called manicure.
Tell the personal experience of a friend around you.
When the girl was in junior high school, her nails became small, ugly, short and severely deformed because she bit them all the year round.
In that process, her mother used all kinds of tricks, such as scolding, preaching, reasoning, and putting berberine water on her nails.
But what I see now is that her nails are very serious and really beautiful. Ten nails in one hand are crystal clear.
I asked her how to do it, and she said that her mother had a holiday before junior high school, forcing her to go to the hospital for nail extraction or something, and then abruptly pulled out the nail plates of ten nails to make them grow back.
Since then, she has completely given up biting her nails.
It is said that this kind of pain seems to be not common enough for her to completely quit this bad habit that she has been unable to quit for more than ten years. So I didn't ask much. I don't know if she was drugged. But according to some people, the process of anesthesia seems to be very painful. I didn't do it. You can find out for yourself, but it seems that it will still hurt.
You can fill your brain by yourself.
My fingernails are ugly because I bit them when I was a child. I haven't bitten them for a long time anyway. Now I put them in my mouth occasionally, I will remember them by myself, and then I will force myself not to take them off. My fingernails are not particularly ugly, but they are not particularly beautiful, because the bite marks are shortened, and they are still the same after a few years. There is really no particularly effective way to improve them.
The first time I heard her talk about surgery, I was really eager.
Then think about the pain.
Forget it.