How to use apply after shampooing and conditioning to towel dried hair. separate hair intosections and spray liberally. blow dry each section with the brush of your choice to activatethe smoothing technology and increase longevity of style. you can also use a hottool to further enhance the shape of your style.thicken your hair ever-y time you blow dry. ever.thicken is our thickening, heat-activated style extender featuring long chain polymers and a volumising cotton sprout complex that creates thicker, fuller hair. activated by the heat of your blow dryer, this weightless spray also helps lock out humidity and extend your style for a long-lasting, frizz-free finish.