Cold laser is ultra pulsed to keep it cool. The pulsing is also to help drive the laser light deeper into the body than it would otherwise get. The pulsing can go several hundred to several thousand times a second depending on how deep the laser is needed.
Laser light deliveres energy to the energy center of the cell called the mitochondrion. This is the manufacturing site for cellular energy. It is at this spot where the laser light becomes energy and the cell can then use it for healing.
Superficial conditions such as skin rashes and burns respond well, and deep conditions like tendonitis, disc problems and muscle spasms respond positively also.
Cold laser therapy also increases serotonin levels which allow the body to heal itself.