Just don't forget to take them back off. I forgot and left mine on for over 24 hours. I showered, put it on, left it on all day and all night, didn't remeraber until I was ready to shower the next day. I wondered why my face was sort of flushed and blotchy when I woke up. I looked up online and found out that's one of the side effects if you leave them on too long.
Emily