As far as I know, root has been heavily warned and discouraged from security experts. Rooting makes the device vulnerable to spyware that pretends to be apps, in addition, rooting will make it impossible for you to automatically update OTA from the company, and security patches, that will make your phone unsafe. We can unroot the device by reinstalling the original ROM for them, if you do not have expertise in this, you should bring the device to the nearest phone store for technical support.