The laser kills fungus that lives in and under the toenail. Dr. Tina uses a NdYAG laser which is one of the most advanced dermatologic lasers currently available. Impulses of high power laser energy pass through the toenail without causing damage to the nail or the surrounding skin. he laser light passes through the toenail without causing damage to the nail or the surrounding skin. At the time of the procedure, the toenail will not become instantly clear, it takes time for the nail to grow out. Nails grow at an average rate of 0.1 mm/day (1cm every 100 days). Fingernails require 4-6 months to regrow completely. Toenails require approximately 12 months. Actual growth rate is dependent upon age, season, exercise level, and hereditary factors.