I need dentists advice please very very urgent!!!!!?

Don't worry, that is totally normal. It's exactly the same when you lose a tooth. The roots of your teeth that they pulled out were there. The brown crumby stuff is just food that was stuck in the little holes in gum. Just be careful not to eat anything too hard near the holes cos if the food pokes them really hard, it's gonna start to bleed. But just wait for about 4 or 5 days and they will be gone and all you will see replacing them is your gum. Hope this helped :)