While steps have been taken to straighten teeth for hundreds dental lab equipment of years, the

biggest steps forward have come in the last few years. Dentists had known for many years that removable plastic appliances could move teeth. Some even made simple plastic

"aligner trays" for minor adjustments. But a major step forward was the invention of Invisalign.

Chishti noticed that if he didn't wear his retainer for a few days, his teeth teeth whitening

machine shifted slightly - but that the plastic retainer soon moved his teeth back to the desired position.

In 1997, using 3-D computer imaging graphics, they created the Invisalign method. The dental profession - perhaps understandably - was initially skeptical because of their lack

of professional dental training.

But, when Invisalign braces became available to the public in 2000, they dental curing light

proved extremely popular with patients. Technology continues to push forward the science of orthodontics and techniques such as digital computer imaging are being used to make

orthodontic treatment more precise.

For example, one system takes a detailed 3-D model of a patient's teeth to help the root canal

endodontic orthodontist develop a precise treatment plan for tooth movement.

As companies develop more precise, high-tech materials and methods, orthodontic treatment will become easier, faster and more comfortable.

Here are definitions of some of the most common orthodontic terms.

Impressions: A mold of your teeth which is used to make a model of them

Panoramic x-ray: An x-ray made by a machine that rotates around your head to dental articulator

give a full picture of your teeth and jaws