This is the science of treatment of teeth misalignment either by using:

Porcelain tooth-colored braces

Clear aligners, which is sometimes the perfect solution for the following reasons:

1. They are clear. Meaning that they are nearly invisible to anyone.
2. Very comfortable to the lips and cheeks.
3. Suitable for patients living abroad as it does not require monthly visits to the orthodontist.
4. Excellent hygiene measures could be easily achieved because there are no brackets that  food gets entrapped around, which in return does not require any special care nor special brushes to clean them.