Hello, It is recommended to choose products with sufficient moisture, such as essential oils, creams, lotions, skin care gels, and ultrasound gels, regardless of brand. It is recommended to use the fat-blasting head three to four times a week, and each time for about 10 minutes on one part. And It is recommended to use the negative pressure head once a week. If you have sha on your back after doing it, do it a second time after recovery. The radio frequency head can be used every day. It is ok if the skin is slightly red. It usually takes 10 to 15 minutes.