Bruxing, grinding, vitamin D deficiency, diabetes, smoking and poor dental maintenance can cause the teeth to shift. Teeth have fibers around them that have memory like rubber bands. If the orthodontist is concerned about shifting make sure you wear retainers and possibly get a fiberotomy procedure done before braces are removed to reduce the risk.

It is natural phenomena. Teeth like to stay in equilibrium depending on tongue, lip, and jaw. Braces try to do some changes with compromised equilibrium and rehabilitation.

Primarily because the bone holding the teeth has been involved and needs to stabilize. That is the reason for retainers.

There is a genetic memory for the tooth and the tooth ligament to return to their original position. That is why retainers are very important, especially in the first couple of years, but actually indefinitely to be used at night.

Right after the braces are removed, the ligaments around the teeth are loose. Over time, the ligaments tighten. Pressure from the muscles of the tongue and lips can move the teeth, as could biting habits.

Because the tissues around the teeth have memories. The only way to prevent positional relapse is wearing retainers the rest of your life.

MDSDDS

Teeth are always in motion and will move if retainers are not worn regularly after braces

Teeth have memory and will try to move back to their original position after orthodontics. It is critical to wear your retainers every night for the rest of your life after treatment.

Teeth have a tendency to move back to original position and that is why you need retainers after braces and we do make invisible (vivera) retainers by Invisalign.

Not wearing retainer