Liquid nitrogen is very cheap because it is a by-product of the production of liquid oxygen. Nitrogen is obtained from liquid air by distillation at -196Â°C. The gas obtained by this process is actually a mixture of nitrogen and about 1.25% noble (or inert) gases, argon, neon, krypton, and xenon.
Damon braces or any of the self-ligating bracketing systems are pretty standard now in orthodontic offices. It varies greatly by city or region, depending where you live, so anywhere between $4000 and $6000.
Read about Damon System at http://damonbraces-px.rtrk.com/q02.php The cost of braces depends on the complexity of the case, i.e., how long the braces will be on, how crooked the teeth are, etc. The only way to know is to schedule an evaluation with an orthodontist.