Deep waves2 what brush to use?

"deep waves and thick waves are 2 different things. the way to make your waves deeper is to grow your hair out a couple more weeks than you would normally would and then cut it, then you repeat this process a few more times."

i let my hair grow out and i bush but its like on the top layer of hair gets wavy i mean it still looks wavy but i was wondering what brush do i use soft medium or hard i usually use soft and medium