Hello: laser is not a radioactive substance, but a laser light source, which destroys hair follicles through photothermal effect and achieves the purpose of hair removal. Laser hair removal is seasonal, because it has no wound and does not need a recovery period, so it can be treated in spring, summer, autumn and winter. However, Guangzhou Huamei hair removal experts suggest that it is best to choose laser hair removal in spring and autumn, because laser hair removal takes 3~5 times to achieve permanent hair removal. But it is best not to be exposed to the sun during the recovery period.