The safety of the instrument depends on the instrument: whether it will be harmful depends on the instrument, because if the machine does not meet the standard, it will have no effect, but it will cause certain harm. For example, some heated appliances can cause burns, and some frozen appliances can cause frostbite.
Whether the beautician is qualified: a good instrument also needs a good beautician to operate, just like a good car. It is difficult to drive it without a qualified driver, but it still needs an excellent beautician to operate it to maximize its performance.
The above two points are Bian Xiao's personal opinions. Do you agree?