BBL affects gene expression and changes the skin at the molecular level. A number of genes associated with younger skin are activated, while others associated with aging are turned off.   It is recommended that you wear safety glasses or shields during the actual procedure to protect your eyes. As the light soaks into the targeted areas, you may feel a warm or snapping sensation. In most cases, the procedure will take no more than 30 minutes.   By activating some genes related to youth and turning off others related to aging, Forever Young BBL penetrates deep into the cells. Therefore, you produce more of the types of proteins and other building blocks you had as a child. As you age, your skin cells actually become younger, giving your skin a youthful appearance.