The evidence for therapeutic effects of very low powered lasers is weak and there is history of deliberate deception by makers of these devices.
It is notable that laser pointers can be bought for $5 but laser therapy devices can cost $750.
See _A Skeptical Look at Low Level Laser Therapy_ by Stephen Barrett, M.D.
> the bottom line appears to be that LLLT devices may bring about temporary relief of some types of pain, but there's no reason to believe that they will influence the course of any ailment or are more effective than other forms of heat delivery.
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Other references
* Role of Low-Level Laser Therapy in Neurorehabilitation
* Efficacy Of Low-Level Laser Therapy In The Treatment Of Neck Pain
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A lot of people find paracetamol effective against pain and a microwaved bag of wheat an effective and low cost method of using heat to temporarily relieve pain.