Basically I'm managing to convince myself that they will find a brain cancers cause if the thing they worried about in her mouth is a cancer it might get from her mouth up into her brain cause i know i am no scientist but i am certain her mouth is close to her brain and it didnt take long for the cancers in Ebony to get from her lungs into her brain so it will take even less time for any cancers in Tigger's mouth to get into her brain

Lungs are further away from her brain than her mouth is, something i am certain of