ok so the way i usually do it is by getting acrylics

but if you don't usually get them or can't because you don't want to or any other reason, just apply garlic every night

if you're allergic to garlic or simply don't want it put nail polish on them or buy some vitamins and eat them

but honestly, while most people tells me that acrylics aren't the way to go, i personally feel like they are since i have this very bad habit of biting my nails (oh and you can always just style your acrylics how ever you want) like me, i just paint them and make sure they're not to long but not to short and make them thin enough to the point where people don't even notice they're not your real nails

*btw those are my real nails :)