"Don't forget to dot your A's"

"No one dots the a for me anymore."
"What?"
"No one dots the a for me anymore."
"What are you talking about?"
"When I was little, someone used to dot my a's for me but no one does it anymore?"
"Who did?"
"Mrs. C did. She used to dot my a so it wouldn't have a round top."
"Did it help?"
"Yeah, it would come out as pointy as roof top."
"Well what's the problem?"
"No one does it anymore."
"Why don't you do it?"
"I forget where the dot goes."
"It goes here."
"Thank you."