just feeling like an awful mom

my 20 month old has a mouth full of teeth. i brush them every single night, without fail. he doesn’t eat or drink anything after i brush his teeth. i hold him still and scrub really good.

yet his whole bottom row of teeth has like dirty black spots on every single tooth. it’s bothered me for a while but his pediatrician said he’s not worried about it because he doesn’t keep these teeth anyways

today i was tickling him and saw the back of all his teeth when he was laughing. all of them are sooo dirty. it looks awful

I just don’t know what better i can do. im going to call his pediatrician tomorrow because they have a list of pediatric dentists in my area that take Medicaid. but i just feel so bad I don’t know what better I could’ve been doing :(