In this second part of their listener Q&A, Lisa and Mike clear up common myths (like whether it’s possible to “overcool” a follicle), explain why pre- and post-cooling matter so much, and dive into the big debate: stamping vs. the gliding SHR method. They also share some important safety insights, and talk about why having an LPA and LSO is essential for running a safe, professional clinic. KEY TAKEAWAYS It is not possible to "overcool" the hair follicle before a laser treatment, as a dark, melanin-rich hair will still absorb enough energy to reach a destructive temperature, even if the surrounding skin is chilled to 0°C. The purpose of pre- and post-cooling (e.g., with ice packs, air, or cryo systems) is to cool the skin, not the machine's optics, and is essential regardless of whether you are using a Diode, IPL, Nd:YAG, or Alexandrite laser. The preferred technique is stamping (one-by-one pulse application) over the gliding SHR method, as stamping allows for a higher fluence, which more effectively raises the temperature of the hair follicle to ensure complete destruction. It is highly unlikely for a white cotton pad to catch fire with a Q-switched Nd:YAG or Pico laser, even at the highest fluence, because white cotton is highly reflective and has poor absorption of the energy. Clinic safety involves a daily checking routine, proper training, and having a designated Laser Safety Officer (LSO) on site, but finding a qualified Laser Protection Advisor (LPA) is the best starting point for a new clinic. BEST MOMENTS "The cooling is to to negate that temperature build-up in the epidermis and help to reduce pain." "But my thought on this, why are you shooting anywhere near the bloody pad anyway?" "The technology really has no bearing on it, because it's got nothing to do with the technology, it's all to do with cooling the skin." "Buying the equipment, getting the training, getting premises, that's the easy part. The difficult part is is promotions and marketing and getting the clients in." ABOUT THE HOSTS Mike began his career in medical lasers in 1986 with a physics degree and a post-grad in bioengineering. He helped develop the scar-free removal of tattoos using a Q-Switched Ruby Laser in Glasgow, and the world's first IPL system. Known well in the industry for his hard truths, no BS attitude and logical answers. As the author of three books, articles for medical journals, a well read blog, a Laser Protection Advisor and contributor to the BMLA, Mike is the Laser Guru. Lisa's claim to laser fame is being Mike's daughter. Growing up with lasers and never avoiding a physics lesson from her Dad, it was natural to enter the industry. Leaving a corporate career with a baby to jump into self employed life came with challenges. Despite that Lisa has been well recognised for her teaching style, practical tips, bringing the compassion to the science, and laser mentoring. Instagram: @dermalase_lasertraining https://mikemurphyblog.com https://www.dermalasetraining.com This Podcast has been brought to you by Disruptive Media. https://disruptivemedia.co.uk/