The Best Products for Hair Extensions: A Care Kit That Protects the Bonds

How to care for hair extensions depends on how they are attached. Tape-in extensions use thin wefts of hair with adhesive tabs sandwiched around a section of your natural hair. Keratin bond extensions, also called fusion or K-tip, are attached to small sections of hair with a keratin-based adhesive that is melted or bonded in place. Micro-bead, I-tip or micro-link extensions are clamped to your hair with small metal or silicone-lined beads. Sew-in wefts are stitched onto a braid. Clip-ins are temporary and removed at night.

Tape and keratin bonds are the most product-sensitive. Oils, conditioners and some styling products can soften or break down the adhesive, and the extensions start to slide out early. Beads are less affected by oil but can slip if conditioner makes the hair under them too slick. Sew-ins need the braids underneath to be cleaned and dried thoroughly to avoid odor and buildup. Clip-ins are the most forgiving, because you wash them separately from your own hair.

The quality of the hair matters too. Human-hair extensions, particularly those described as Remy, where the cuticles run in the same direction, can be washed, conditioned and heat styled like natural hair. Synthetic extensions are much less forgiving: many cannot take heat at all, and conditioners made for human hair do little for them. If you are unsure what you have, ask your installer or check the manufacturer's instructions before using any new product.

Whatever the type, the extension hair itself gets no natural oils from your scalp. That is why it dries out, tangles and mats faster than your own hair, and why a moisturizing routine for the lengths is part of good care.

You do not need a shelf of special extension products. Most of what is sold as extension-specific is ordinary hair care with a new label. What you need is a short kit that covers the jobs extension hair cannot do on its own: gentle cleansing, moisture for the lengths, low-friction detangling, protection from heat, and protection from friction overnight.

The core of the kit is a soft brush and a sulfate-free shampoo. The brush handles daily detangling, which is the number-one way to prevent matting, and the shampoo cleans the scalp without stripping the extension hair. Add a lightweight rinse-out conditioner used only on the lengths, and a leave-in spray to make brushing easier.

Optional but useful are a light oil or serum for dry ends, a heat protectant if you blow-dry or use hot tools on human-hair extensions, and a silk or satin pillowcase or bonnet. A wide-tooth comb for wet hair and soft scrunchies for braiding at night round it out.

What to avoid matters just as much. Skip heavy oils, masks and conditioners near the root area, products high in drying alcohols, harsh clarifying shampoos used often, and rough towels. Many installers also advise against dry shampoo on tape bonds, since powders can build up around the tabs. When in doubt, a quick message to your installer can save an expensive reinstall.

Many installers advise waiting a day or two after a new tape-in or keratin install before the first wash, so the adhesive can set fully. Ask yours for their exact timing. After that, washing two or three times a week is enough for most people. Washing every day wears down bonds faster and dries out the extension hair.

Detangle gently before you get in the shower, since washing tangled extensions makes knots worse. Wash with your head upright rather than flipped forward over a sink, which can twist the hair and tangle the lengths. Apply a small amount of sulfate-free shampoo to your fingertips and massage the scalp between the rows of extensions using the pads of your fingers. Let the lather run down the lengths rather than scrubbing them, and avoid rubbing directly over tape tabs or bonds.

Rinse thoroughly, because shampoo left at the roots can cause itching and buildup. Then apply conditioner only from the mid-lengths to the ends, keeping it several inches below the attachment points, and rinse well. For the best shampoo for tape-in hair extensions, look for a sulfate-free formula that rinses clean; if it is labeled heavily moisturizing or rich in oils, keep it on the scalp only.

Drying is as important as washing. Gently squeeze water out with a microfiber towel or soft T-shirt instead of rubbing. Then dry the roots and bonds completely, using a blow-dryer on a cool or low setting if needed. Leaving bonds and braids damp is linked to slippage, mildew odor and matting at the root. Dry the lengths with a heat protectant if you use heat.

The best brush for hair extensions has soft, flexible bristles or looped bristles that slide past the bonds instead of catching on them. Stiff plastic ball-tipped brushes and fine-tooth combs can snag bonds and pull on the natural hair they are attached to. Boar bristle brushes are gentle and good for smoothing clip-ins, but dense bristles can grab around tape and keratin bonds, so use them carefully.

Technique matters more than the brush. Hold a section of hair in one hand just below the bonds, so the brush pulls against your hand rather than your scalp. Brush the bottom few inches first, then move up a few inches at a time until you reach your hand. Brush two or three times a day, including before bed and before washing, because small tangles become mats quickly in extension hair.

When it comes to how to sleep with extensions, never go to bed with wet or damp hair. Damp hair tangles and mats at the nape overnight, and wet bonds stay soft longer. Brush your hair out, then put it into a loose braid or a low, loose ponytail secured with a soft scrunchie rather than an elastic with metal parts.

Sleep on a silk or satin pillowcase, or wear a silk or satin bonnet, to reduce friction. Avoid tight buns or high ponytails for sleep, which put tension on the same points all night. In the morning, take the braid out and brush gently from the ends up before styling.

The best oil for hair extensions is a light one used in tiny amounts on the ends only. Extension hair does need moisture, but the risk with oils is migration: oil applied near the roots works its way into tape and keratin bonds and weakens the adhesive. Silicone-based serums and light argan oil treatments are popular because a drop or two goes a long way and they feel less heavy than thick oils like castor or coconut.

Apply oil to dry or damp hair, starting at the very ends and working up no higher than the mid-lengths. Avoid pre-wash oil treatments and oil masks on the scalp while you have tape or keratin extensions, even if you used them before your install. If you have sew-ins or beads, ask your installer whether scalp oils are safe for your method.

Leave-in conditioners follow the same rule. A spray format is easiest because you can mist product onto the lengths while keeping the bottle angled away from the roots. Use less than you would on your own hair; extension hair has no way to absorb product through the scalp and can quickly feel weighed down.

Heat styling human-hair extensions is fine with care. Use a heat protectant on the lengths, keep the temperature moderate, and keep curling irons and flat irons away from the bonds, since high heat can soften keratin bonds and tape adhesive. Synthetic extensions are different: many fibers can melt or frizz under heat, so do not use hot tools unless the manufacturer says the fiber is heat-resistant, and check the safe temperature.

Extensions can cause real hair loss. Traction alopecia is hair loss caused by repeated or prolonged pulling on the hair, and it is a recognized risk of extensions, tight braids, weaves and tight ponytails. When extensions are too heavy for the natural hair they are attached to, or are installed too tightly, the constant tension damages the follicles at those points.

Early traction alopecia is often reversible if the tension is removed. Over time, though, ongoing pulling can scar the follicles, and the hair loss can become permanent. That is why it is worth catching early. Warning signs include soreness, tenderness or a feeling of tightness after an install, small bumps or pimples around the bonds, headaches from tension, broken hairs or short hairs around the attachment points, and thinning along the hairline, temples or nape.

To lower the risk, choose an experienced installer, ask that the weight of the extensions be matched to the thickness of your own hair, and do not add more hair than your natural hair can support. Keep up with maintenance appointments, often called move-ups, so that bonds do not hang too far from the scalp as your hair grows, which increases leverage on the roots. Give your hair breaks between installs, and avoid layering tight ponytails on top of extensions.

If you notice any of the warning signs, have the extensions loosened or removed and see a dermatologist, especially if you see thinning or patches. Extensions are also sometimes used to hide existing thinning, but adding weight to already fragile hair can make things worse. If you are thinning, a hair topper or clip-ins worn only for short periods may be gentler, and a dermatologist can discuss treatment; topical minoxidil is the only over-the-counter drug approved to regrow hair.