Stretch marks could be a night mare for many people, it's how ever important to understand that it takes a while to disappear or improve.the treatment should be used until improvement is seen.this could last up to one year. The use of Shea butter in the treatment of stretch marks can not be overemphasized this is because of its ability to help rebuild destroyed collagen. Another treatment that helps is the use of laser , fraxel, E light and the likes of it. Preventive s like stoping the use of bleaching creams, gradual and healthy weight loss will also help. The use of collagen builder during pregnancy(topical ) will also be an advantage. Good luck!