What are these white spots/lines on teeth after I got Invisalign attachments?

I just got my invisalign attachments on today. I DO NOT have attachments on my front teeth, however I do have them on the teeth next to my front teeth. After leaving the orthodontist and looking at my teeth I realized that there were white spots/lines on my front teeth (the teeth with no attachments) that I am positive we're not there before I got the attachments. what caused this and how do I get rid of it?