Is it possible to make you forgot about something or is it impossible to do?

While we can forget an unpleasant experience or piece of information, it's not healthy. This is the mechanism that explains post-traumatic stress disorder (PTSD). After a horrible experience, the brain can suppress certain details or even substitute a false detail as a defense against re-experiencing the memory. The goal of therapy for PTSD is to retrieve the true memory and process it normally.