into vs in to

The word “into” is a preposition that expresses movement of something toward or into something else. 

I made it into work a few minutes early today. 

The tooth fairy tucked the tooth into her pocket before placing a $1 bill under my daughter’s pillow.

“In to,” on the other hand, is the adverb “in” followed by the preposition “to.” They aren’t really related and only happen to fall next to each other based on sentence construction. 

The principal came in to our room to observe our class.

He broke in to the house and stole all of my mom's jewelry.