dreams are you questioned about them?

firstly,no scientist has been able to explain the concept and the reason behind dreams,there are many whats and whys about dreams,but as far as what i have experienced is,dreams come from your mind the things incomletely thaught some days before or heard before and you tried to conclude something out of it and were left with some questions,so somewhere somehow dreams are linked with with your thaughts,i would really like to know others opinion,please respond with your experiences.

I'm always having weird dreams. The one I have the most often is about my teeth falling out. Like I just keep spitting more and more teeth out of my mouth and it wont stop! ...last week i had another strange dream and it was about my teeth falling out and while i was in the dentists office to have them glued back in (yes, glued, lol) I ran into a girl i went to school with that i hated and we started arguing and she said something about, "well atleast im not pregnant!!"...and that freaked me out like some sort of premonition!..then 2 days later my mom tells me that she had a dream that i told her i was pregnant with a boy (and i didnt tell her about my dream)!..the thing is, i had my tubes tied, cut and burned after my last c-section and my husband had a vasectomy, so it's virtually impossible, but still freaks me out!