False.
Blow-drying from beneath is a great solution for women with thin hair to add volume. Starting at the roots, blow dry in the opposite direction to your usual style and enjoy plenty of volume.
L'Oreal Professionnel Tecni Art volume architect spray will help thicken and texturise the look of fine hair whilst protecting from the heat of blow drying.
Another good one for guys, use L'Oreal Professionnel Homme's Densite shampoo to provide extra body and texture, then condition and blow dry to keep hair from matting together, which normally gives the appearance of thinning on top.
