This 2500 grit sandpaper works great on dull nails and ridges and after using that if you want a lot of shine just rub the nail with the plain paper side. It works almost a little too well like I used clear nail polish so I dulled them a little by using the this fine sandpaper again. It bothered me having somewhat "crusty" toe nails and this fine grit sandpaper made them look real healthy without it looking like I put effort into it or did anything fake.
And instead of clippers I tried the Dremmel and stone and it works great. I think they sell a nail version but I already had one. This is so quick and easy, why spend money in CVS or Walgreen's on over priced nonsense just go in the garage !