Clips are not dangerous for your hair if you use them carefully. For instance, make sure they’re not too tight or they might pull and break the hair shaft. For this reason it is highly recommended to remove all your hair clips before going to bed. If you have fine hair, look for rubberized clips which won’t crease your hair. At the same time, you should make sure that the metallic clips in your hair don’t overheat when using a blow dryer. To prevent that, always rotate the drier around your head and don’t leave it in the same spot for too long.