hi, my name is C.. yes, i had a 2 yr old fall, and chip a tooth, ect. i also had a granddaughter fall and damage her 2 front teeth.
the grayness is probably nerve/root damamge from the fall. it will probably remain that way until they loose the tooth/teeth later, to get their permanent teeth. we never had any other problems. just the fact that it looks kinda yucky! health-wise they were fine.
take care, and good luck!