Serving size: A grape

"Using too much could ultimately dry your hair out," says Swayze. Concentrate the product on the most damaged areas.

Serving size: A quarter

More than a quarter and you risk crunchy hair that's hard to style. For smooth application, massage the gel in your hands first to avoid clumps.

Serving size: A mandarin orange

"Too much mousse in one area and you won't be able to get the brush through it," says Swayze. Apply it to the roots first, because that's where you want the most lift. Comb the product through before blow-drying.

Serving size: A marble

"Less is more with oil-based products. Otherwise you'll look like you haven't washed your hair in days," Swayze explains. Massage wax and pomade into your hands first to avoid clumps.

Serving size: A strawberry

If you use too much shampoo you'll wash away the natural oils that protect your hair. With a light massage, apply shampoo to the roots only, says Swayze. Rinsing with water cleans the ends sufficiently.