Unless your hair is already extremely damaged or weak then no. In fact it can actually be good to give your hair a break from all the styling and straightening. Sometimes when these dreads are tied back too tightly it can pull on your roots, so if you notice any pain when your hair is tied back then try to locate the dread which is being pulled too much and ease it out slightly to relieve the tension (although obviously it is normal for newly installed dreads to feel a bit tight on the scalp).
Posted in: 3. Temporary Dreads