Hey BB 
I need to make a pause of at least 4-5 weeks between each "rolling session" because that's the time the skin needs to heal and produce collagen. If you use a 1.5mm roller more often, it can cause harm to the skin (at least this is what I read recently). So I will use my roller for the second time next week. Until now I do not see any difference. I read it takes 3 months to see an improvement.
On which places are your stretch marks, if I may ask?
I need to make a pause of at least 4-5 weeks between each "rolling session" because that's the time the skin needs to heal and produce collagen. If you use a 1.5mm roller more often, it can cause harm to the skin (at least this is what I read recently). So I will use my roller for the second time next week. Until now I do not see any difference. I read it takes 3 months to see an improvement.On which places are your stretch marks, if I may ask?