I have a longer list here:
http://www.hairfacts.com/tips/laserchoose.html
but this is a good overview put together by lagirl.
Questions to the person who would perform the treatment:
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What are your education, training, and any professional affiliations as it relates to laser hair removal and any other types of hair removal (ex. Electrolysis)?
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How many years of experience do you have with the device to be used?
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How many clients treated with this device?
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How many clients do you treat with my skin tone and hair color and what are the typical results?
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What kind of pain can I expect?
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What do you use for patients who find it uncomfortable?
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Do you write prescriptions for EMLA anesthetic cream or painkillers?
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What is the brand of device and manufacturer device that you will be using on me? (ex. Alexandrite, Diode, Nd:YAG, Ruby, IPL/Flash lamp)
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Is this device cleared by FDA for permanent hair reduction?
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How long have you been using this specific the device?
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Is this the best device for my skin tone and hair color?
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Why do you use this one versus the other devices available on the market?
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What are the benefits for me versus the other devices available?
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What sort of skin cooling do you use during treatment?
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What side effects have you seen using this device and how long did they last (best/worst case)?
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What percentage of clients has had those side effects?
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Can you provide any contact information of clients who are pleased with results and possibly have not had treatments in over 1 year (especially with my same sex, skin tone, hair color, and area treated)?
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What kind of results can I expect on this particular area in my case and in approximately how many treatments?
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Do you offer any guarantees that my treatment will result in permanent hair reduction?
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What happens if I don’t achieve the results you indicated? What is your policy on this and can I have it in writing?
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Do you offer discounts for buying treatments in a package? If so, does your policy allow for a refund of any unused portion of all treatments are not completed for any reason (if this depends on the reason, please explain and provide it in writing)?
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What percentage of your clients doesn’t respond to treatment or are not satisfied with results?
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What is your policy in the case of client dissatisfaction?
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If I still have hairs after I complete the number of treatments you recommend, what is your policy?
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If I have a change in skin tone or a burn from treatment, what is your policy?