Restore Dull Hair

Hair lacking in luster? You might be suffering from build-up. Start by using a clarifying shampoo to remove stuck-on conditioners and styling products. After you wash and condition, try a quick cold-water rinse -- hair scientists won't tell you that this trick works, but many swear by it.

Conditioners with a little silicone can add shine, as can silicone serums; avoid leave-in conditioners and products that lend volume. Spray-on shine products work well, but don't overdo it, as they build up quickly and can look greasy. For a serious case of the dulls, try a colorless gloss.

Another cause of dull hair is damage from processing or overbrushing. Damaged hair cuticles don't lie flat, so they can't reflect much light.