Hello, yes it is ok to use numbing cream before laser hair removal although we don't usually recommend it. The laser technology has advanced over the years making it a much more comfortable treatment. If it is too painful this could signal that you're getting a burn and the settings need to be adjusted. I prefer that my clients aren't numb so they can effectively scale their pain for me and I can provide a safe and effective treatment.
It may be better to take a mild medication for pain such as Tylenol or Ibuprofen to take the edge off because undue pain may indicate excessive heat leading to burns of the skin particularly with darker skin tones. Most lasers have a built-in cooling system or one can be employed separately to reduce the discomfort. Slowing down the time between pulses may help also.