The black side with diamond dust removes roughness and discolouration. Buff accross the top of each nail for 5-10 seconds. Use this side only once a month until the nail grows back again. Using it more will make the nail thinner.
The stimulating green side of cotton restores the colour. Buff accross the top of each nail for 10-15 seconds, repeat this step every two weeks.
The white side of silk conjures up an amazing shine for all week to 14 days. Buff each nail until you get a shiny nail.