Control Brush is a local anesthetic that acts as a genital desensitizer for men. It reduces the tactile sensitivity of the penis during sex in order to delay ejaculation. Dosage: For adults only. Apply 3 to 15 drops of Control Brush on the penis. Do not exceed 4 applications per day. For more details, read the information sheet. Control Brush is a local anesthetic that acts as a genital desensitizer for men. It reduces the tactile sensitivity of the penis during sex in order to delay ejaculation.