Blow drying your hair every day can damage it and make it extremely rough and dry. The hair also loses its natural shine and becomes dull. That's why you should not blow dry your hair more than once in 14 days. Ideally, it is advisable to avoid blow drying altogether or go as long as you can between blow drys. However, if you can't part from your hairdryer, at least follow these tips to help reduce the damage: 1. Use ionic hair dryers. They dry hair faster and limit the hair's exposure to the heat of the dryer. 2. Use a heat protectant serum or a spray before blow-drying your hair to minimize the damage. 3. Keep the nozzle as far away from your hair as possible. The closer you keep it to your hair, the more damaging it is. 4. Use the lowest heat setting for drying your hair for the least damage. 5. Air dry your hair first. Apply a dryer only after your hair is at least 60% dry. Don't blow dry dripping wet hair.