Long hair
When blow-drying with a brush it depends on the length of the hair to what size brush you will need, long hair you will need to use a big round brush to make it straight, taking a small section of hair at a time putting the brush in at the roots under the hair and holding the dryer over the top of the hair always making sure that the dryer always faces down the hair shaft (roots down to tips). Holding the hair as tight as you can work the bush down the hair with hair dryer following the brush, Do this all over the head.

Tips on what you need

1) products
2) hair-dryer
3) large round brush (43mm to 53mm)
4) 2 hair dividers