That user reports that Google was willing to send out a replacement device, but those complaining of the screen scratches and lines say that Google refuses to replace the devices, reportedly stating the marks are the result of
normal daily usage.
To make things simpler for parents, the American Academy of Pediatrics has even gone on to specify a
daily tablet
usage limit of 2 hours at the most as anything more than that could have an adverse impact on their
normal activities, which includes sleeping, playing and such.