how does this happen and how to fix it? these ugly lines.

here’s the picture to my problem:

I already tried pressing CTRL + N but it didn’t work the lines are still there :frowning:

try to remoe double verts???
why don`t ya post your model, so we can try to fix it??

thanks but after a few searches about the problem on google I manage to fix it thanks for offering your help really appreciate it :slight_smile: