We put our lashes through a lot: coating them in mascara, curling them, sticking on falsies, and frequently rubbing at them with makeup remover and cleanser. This does damage over time, and lashes, like hair, need conditioning to look their best. There are so many eyelash and brow serums on the market now [1] designed for this purpose, and we've seen that some can deliver truly incredible results [2], with lashes growing much stronger and longer. But they require patience and frequent application: you'll only get luscious lashes if you studiously apply the serum morning and night for at least a month . . . something that's easier said than done when Nouveau Lash & Brow Conditioning Serum [3] ($33), but others contain oils that may break up the bonds in your lashes. Aftercare varies hugely depending on the type of lashes you've had applied, so always trust in experts, not the product packaging. Most serums are designed to be applied to bare lashes, and this will give you the best results.