http://www.techradar.com/news/face-id-on-iphone-x-is-going-to-be-safer-than-you-might-think

Apple executive Craig Federighi has confirmed that there will be a way to temporarily disable Face ID by pressing the side buttons on the iPhone X.

Face ID is one of the big talking points coming off the back of the iPhone X announcement this week. The new flagship from Apple will use a scan of your face to open, replacing the Touch ID fingerprint scanner.