I wore back to back braid for most of my childhood starting around the first grade and adulthood up to around 22-23, when I got serious about growing my hair out and learning my natural hair better. I would have braids anywhere from 2 weeks to 3 months(no kidding... the middle would be the original braids, the perimeter would be fresh and I would have inches of new growth in the middle... it would be pulled up into a bun so no one could tell the middle braids were the oldest... when I started braiding my own hair I would just rotate doing a section every month or so my whole head always looked fresh braided). Other times I would take my hair out on the weekend and have my hair back braided within a week. My hair was always super thick and between between APL and BSL. I know now that I was way too rough with my hair on take down days. I also allowed my braider(before I started braiding my own) to be way too rough with my real hair. Being too rough and allowing too rough were the main factors that prevented me from retaining much more length back then because I had really good growth with the braids. I still love braids; it just takes too long to braid my hair now so I no longer do. I never really had scalp damage or bald spots. I never had any scalp issues. However, I do think it is very important to learn your real hair along the way even if you love protective styles. By learning your real hair along the way you make it less likely that you real hair won't overwhelm you because you learned it step by step, as opposed to trying to handle an overwhelming amount of hair once you reach your goal. I, personally, have had to cut major sections of hair after reaching goals first and trying to learn my haircare second. I have also experienced a hair dresser set back because I had a great head of hair I couldn't style the way I wanted myself and trusted someone else to to my hair while I was still trying to learn styling a large amount of natural hair(it was weird I could braid like nobody's business but learning natural hair was a brand new thing to me when I started actually styling my hair as opposed to just washing and braiding it back up). When I learned how to keep APL hair cute and healthy then it was more practical for me to not ruin it when I was keeping BSL hair cute and healthy then to mid-back hair cute and healthy etc.....