Started brushing my teeth with 2 tooth brushes at the same time about a month ago. now I cannot go back to using 1. it makes no sense to only use 1. no matter if you are a thorough 2 minute cleaner or a get in, get out type of guy (or gal), it doesn't matter. get twice the clean with this life hack. why only 1. who said. modern western society? fk! them.