Forget to refill

Some insignificant memory stay. I wonder if my brain has a deleting function. Next if that memory come up i will try to add a capture-quick-reaction to change it.
If I remember a classmate mentioned a trick by a cooker, I'll force me to think on reaction instead of "let it go", I'll say to myself: "I must change this to an important one, this one is obsolete, delete it. or associate a more worthy one to fill a vacancy,..." gradually hope my brain may delete it.