In response to your question: Braces do cause teeth to "loosen?" As they move, the bone around them adjusts. However, once the teeth are in their final position, your orthodontist will keep them in the final wire until the bone resettles around your teeth and they will not be loose. Of course, it is important to wear your retainers as teeth move throughout life.
Hope this helps.
Steven Chamish, DDS
After your braces are removed, you are given a retainer to wear. While your bone around your teeth is becoming more dense, you need to wear the RETAINER 24/7. Most patients remove their RETAINERS when they eat. School lunch GARBAGE cans have been dumped LOOKING for a RETAINER THAT WAS ACCIDENTALLY THROWN OUT. A SEVERELY DISTRESSED STUDENT KNOWS IF THE RETAINER IS NOT FOUND, THE PARENTS WILL HAVE TO PAY $300 + TO REPLACE THE RETAINER. YOU BEING AN ADULT SHOULD EAT WITH THE RETAINER AND GO TO THE LADIES ROOM TO
RINSE YOUR RETAINER.
Good for you for interest in straightening your teeth. It helps in so many ways!
Regarding your question about braces making your teeth loose; Yes, they make your teeth loose. This is how moving and shifting teeth around work. First the teeth have to become loose so they can be moved. However, are you are asking about whether your teeth will become loose after your braces? There is the possibility (although rare) that a root on one of your teeth resorbs (wear away from the tip of the root down) while the braces are moving your teeth. If this continues, it is possible to have nice straight teeth; but the tooth with the resorbed root will feel loose. The result is normally just the feeling of a loose tooth. Interestingly enough, this does not usually happen with invisalign. Hope this helps.
My best to you!
William F. Scott IV, DMD