This fairy tale is based on a 16th century noblewoman. Her brother used small children to do copper mining. These children were deformed due to the requirements of mining. They referred to these kids as dwarfs.
History behind the fairy tale.
The new queen whom married Snow Whites father.
The Queen wanted Snow White dead because she wanted to be the "fairest."
Even though the Queen tried many of times to kill Snow White the seven dwarfs kept saving her.
So the Queen got Snow White to eat the positioned part of the apple and Snow White died.
The Prince came and got Snow Whites coffin and saw the piece of apple she ate and pulled it out of her mouth and saved Snow White.