Likeliness of number of trays being realistic
I just started Invisalign today (feel so ugly, bleh) and I noticed how it says 1 out of 40 trays. I know the number often gets upped or prolonged if issues still need to be fixed. I just wanted to ask what are the chances of 40 trays being the end number, or is it just 9 times out of 10 you'll likely have to prolong your treatment?
Is the initial end number of trays ever actually realistic? Sorry if this is a dumb question, I am in the beginning "feeling ugly" phase so I'm trying to gauge how much longer I'll be stuck like this.