Is it ok to change the laser machine after doing some treatments? (Photo)

If you're not seeing the results you hope to see from one type of laser, I encourage you to try a different technology and/or a different certified laser technician. A multi-wavelength device like the Candela GentleLASE® Pro could give you better results.
CarollDelo, Simply Smooth Laser Center at Castellano Cosmetic Surgery Center

Thank you for your question. It is possible for some hair to re grow due to hormonal changes in the body. Its possible the settings need adjusting to continue to have results. It is ok to switch to a different laser if that's what you choose to do.

There are many variables involved in determining level of expected reduction in laser hair removal treatments and the device to be used.

These include;

hair type

hair color

skin color

hormonal changes

oral and topical medications

It is possible that adjustments had to be made to your settings so keep the laser hair removal safe and effective.  There are many reasons that could be the cause of your lack of results beyond the device.  Yes the device may not be the best for your skin color and hair quality and would warrant "changing" devices.  it could also be the lack of training and experience of the provider/practice.  It cold also be that your hair is too light for it to work and they did not know to tell you that when they should.  I would make sure you are going to a practice with experts (physician and provider) in laser hair removal, if not i would seek another opinion.  
Remember, it is important to go back to the technician / physician who originally did your treatments to make sure your are on the right path to achieve your desired outcome.  Hope that helps.