A lot of times people don’t have the money or time to straighten their hair with a straightener or a flat=iron. I have a very easy way to do it without using anything but a flat paddle brush and a blow dryer.
Start by washing your hair with shampoo and conditioner like normal. For best results, make sure to use conditioner and shampoo for straight hair.
Towel dry your hair until it's damp, not dripping wet.
Turn the blow dryer on to high and pick up pieces of your hair with the paddle brush, drying from root to end. Continue until most of your hair is dry on the bottom.
Turn off your blow dryer and flip your hair over. Brush it out straight from root to tip.