How dare you "to" do so? Does it need "to"?
thank you.
....................
I'm not a teacher
....................
No, it doesn't need "to", it can behave like a modal verb.
dare (to) do something
I daren't go home.
Only a few journalists dared to cover the story.
She hardly dared hope that he was alive.
Dare we admit this?
how dare you (spoken)
How dare you accuse me of lying!
Longman - dare