text: When filing on the side of the 80 grit file, the gel on the nails is removed faster. However, when the professional has already removed 90% of the gel, you should switch to the other side that has the 180 grit in order to be able to remove the rest. The reason for this procedure is to avoid that the coarse file with grain 80 scrapes the nails too much. The 180 grit makes the nail smoother and softer, which greatly benefits the service for a smooth effect of the polish when applied to the nails. The files can be disinfected by spraying. You should not dip the files in disinfectant liquids.