False lashes can be used multiple times if you clean them correctly. Beauty influencer and Lashylicious CEO Farah Mereb cleans her false eyelashes after every use to get the most wear out of them. She first peels the glue off of them, then she soaks them in warm water and micellar water. After they have soaked, she brushes them out and recurls them. You can see more here: https://www.instagram.com/farahpromakeup/