Has anyone ever seen Darkness Falls? If yes, I have a question....

In this movie, the legend is that if you look at the Tooth Fairy's face, she will kill you. As predicted, all characters that looked at her face ended up dead. But...the tooth fairy is wearing a smask. Therefore you're not really seeing her face. Wouldn't that make the fact that they look at her not count as seeing her face, and that the tooth fairy is killing for the wrong reasons?

Or does it just not matter?

It just puzzles me :/