All skin types, except sensitive use nightly. If sensitive use every other night until your skin becomes tolerant to using nightly. Begin with Gentle strength, then move up to Strong, Extra Strong then MAX after consulting your skin care professional. Some individuals may never be able to tolerate higher strengths. Follow with your Dermaware treatment as per your recommended regimen. Call 888-292-DERM for more information or for a Dermaware Spa near you.