Ask a doctor  Will Missing Teeth Help Braces Work Faster?  I
have one missing tooth on the lower and uper teeth, when i get
braces will that gap help in getting my teeth straighten faster?
Doctor Answers (3)  Will missing teeth help speed tx?
unfortunately, probably not as missing teeth on just one side
makes keeping the dental midlines centered on your facial
midline much more difficult (usually anyway!  Saint Louis
Orthodontist  MIssing teeth: speed up braces?   The answer to 
your question is: it depends!  Often missing one tooth in the
back can complicate treatment.  Missing an upper front tooth may
also make treatment with braces take longer if you've had a lot
of tooth drifting.  TOn the other hand there are cases where
missing one tooth in the lower front could actually speed up
treatment.  Orthodontics can be a bit complicated and often the
best solution to a patient's problem is a unique treatment
plan designed just for them, taking into account the unique
attributes of their case.   Brian Povolny