If your hair is oily, you don’t need a deep conditioner. If your hair is fine in texture or normal in temperament, you probably don’t need a deep conditioner. But if you are sporting dry, damaged, wavy, curly, or chemically treated tresses, a deep conditioner is a must. These intensive conditioners – sometimes called hair-repair treatments, moisturizing packs, or hair masks – boast super concentrated levels of high-powered moisturizers. They are designed to penetrate the cuticle and condition hair, fill in gaps in the cuticle layer, add a degree of strength to fragile strands, and blanket hair in protective lubricants, as well as prevent tangles.
Most deep conditioners are used immediately after shampooing and allowed to sit for 10 minutes to 2 hours. Some require that you wrap your head in a towel, others suggest you apply heat to help the product better penetrate the cuticle layer, and others need nothing more than for you to sit around for a little while. If your mane is merely dry, a treatment every 1 or 2 weeks should be enough; if your tresses are fried you might benefit from a treatment after every shampoo – in fact, you might try replacing your regular everyday conditioner with a deep conditioner until your hair improves.