Q. hello…i have just started wearing invisalign braces and have now had them for 2 weeks and wondered if its normal for them to be loose. my bottom set fit fine but the top set seem to move causing me to spit and lisp…not very attractive! my top two teeth are slightly crossed and tend to slant backwards so wondered if this was the cause. its making me quite unhappy as i try not to speak too much as i know i’ll be speaking funny and its so obvious…i feel like i’m wearing badly fitting dentures!my sister got hers fitted a week after mine and hers fit snugly and she speaks fine…you would never know shes wearing them. hope you can answer this for me before i go back to see my dentist. thank you,