Yes, fairy hair can be straightened. There are a few methods you can use to achieve this look. You can use a flat iron, hot rollers, or even blow dry your hair straight. Whatever method you choose, make sure you use a heat protectant product beforehand to help keep your hair healthy and prevent damage. Start by dividing your hair into sections and then slowly work through each section until it is completely straight. Depending on your hair type, you may need to repeat this process a few times to get the desired results. Remember to take breaks in between so that you don't overheat your hair and cause any damage.