<div id="emb-p-e601ab6bb27a0c371e82b28c"><a href="https://www.alleywatch.com/wp-content/uploads/2014/12/Screenshot-2014-12-11-00.18.15.png"> </a></div> <script src="http://a.goember.com/emma.js?pl=e601ab6bb27a0c371e82b28c" async=""></script> A new service from password manager Dashlane can change a bunch of your passwords all at once. Personal Tech columnist Geoffrey Fowler visits the dentist’s office to show what flossing and changing passwords have in common.