Will orthodontic treatment cause any change in your facial muscles years after the treatment is complete? i am worried if my lower lip will go further inward (lower teeth is already way lot inward)

Usually not: Depending on the cause of your lower lip position, orthodontics may actually improve it. Of course long term stability is dependant on compliance with your retainers after treatment is complete.

Not likely: When your orthodontist moves your lower teeth to relieve the crowding of your teeth, your lip with go with them. Therefore, your facial appearance will look much better. Best to talk to your orthodontist personally, though, because there could be more to it than that.

It shouldn't: Best to review with your orthodontist, but the lips only do what the teeth tell them to do, therefore, if the teeth come forward, the lips will do the same.

Yes, but.....: Your lower lip will change. However, this is a goal that can be managed by your orthodontist. If your lower teeth already "go inward" then to correct your problem the orthodontist can push the teeth forward to support your lip. Orthodontics should be tailored to your individual case.

Unlikely: Depending upon what "years after" means, it is normal to see aging changes in the face. The nose, chin and ears grow until our last day. Lips tend to thin out as we age. Lips may appear to move inward. Wearing your retainers to maintain your result is the best insurance to minimize these changes.

Variable: Usually it's the muscles that can determine where the teeth will reside. Lower teeth ideally should rest just inside the upper front teeth. Orthodontics can improve all the cosmetic and working relationships. Trust your orthodontist to discuss this with you.

Not really: Most of the changes to your profile will be apparent when treatment is complete. If you don't wear a retainer it could relapse somewhat. Your orthodontic treatment should be designed to give your lower lip more support.

No: Our faces all change as we get older, but orthodontic treatment, in and of itself, should not have any added negative impact on you. Your orthodontist should account for adjusting your teeth and profile to account for the changes that nature brings over time. Bottom line-- its no fun getting old!

To the contrary: If teeth improperly positioned treatment by an Orthodontic Specialist will position the teeth to give optimum lip support. See an Orthodontist for initial Examination (usually free or modest cost). Malocclusions are like snowflakes, no two are exactly alike. See a Pro.