Nail Care 101: Common Nail Concerns and How to Support Healthy Nails

Nails are made of layered keratin, the same protein found in hair and the outer layer of skin, and like both, they reflect a combination of genetics, habits, and overall health. Brittle, ridged, or peeling nails are common and usually manageable with consistent care, though a few patterns are worth a doctor’s attention.

This guide covers the most common nail concerns, what typically causes them, how manicures and gel polish factor in, and a simple daily routine to support stronger, healthier nails. Explore the body concern collection for related skin and body-care products.

The Basic Anatomy of a Nail

Before troubleshooting a nail concern, it helps to know what’s actually being affected. The nail plate is the hard, visible part of the nail, made of layered keratin cells. It grows from the nail matrix, an area hidden just under the cuticle at the base of the nail, which is why damage to the matrix (rather than just the visible plate) can affect nail growth for months afterward. The cuticle is the thin layer of skin sealing the edge of the nail plate to the finger, forming a barrier against bacteria and irritants. The pale, crescent-shaped area sometimes visible at the base of the nail is the lunula, part of the visible nail matrix.

Quick answer: Nails grow from the matrix under the cuticle, and the visible plate is made of dead, layered keratin cells — which is why nails, unlike skin, can’t “heal” damage; they can only grow it out.

Common Nail Concerns and What Causes Them

• Brittle, splitting nails (onychoschizia). Usually caused by repeated exposure to water and drying agents like soap, detergents, or nail polish remover, which strip natural oils from the nail plate faster than they can be replenished.
• Ridges. Vertical (longitudinal) ridges running from the cuticle to the tip are extremely common and generally increase with age; they are rarely a sign of an underlying problem. Horizontal ridges or indentations, by contrast, can sometimes reflect a temporary disruption to nail growth (from illness, injury, or nutrient deficiency) and are worth mentioning to a doctor if they appear suddenly across multiple nails.
• Peeling in layers. Often linked to the same wet-dry cycling and chemical exposure that causes brittleness, since it separates the nail’s layered keratin structure.
• Slow growth. Nail growth naturally slows with age and can also be affected by poor circulation, certain medications, or nutritional gaps, though average growth rate varies significantly between individuals regardless. On average, fingernails grow roughly 3mm per month, meaning a full nail typically takes three to six months to grow out completely; toenails grow more slowly, often taking twelve to eighteen months.
• Dry, cracked cuticles. Usually a straightforward hydration issue, worsened by frequent hand washing, cold weather, or picking at the cuticle.
• Discoloration. Yellowing can result from prolonged dark nail polish use without breaks, while other colour changes are less common and worth a closer look if isolated to a single nail (see the “When to See a Doctor” section below).

Daily Habits That Support Healthy Nails

• Limit prolonged water exposure. Wearing gloves for dishwashing, cleaning, or other wet tasks reduces the repeated wet-dry cycling that weakens the nail plate over time.
• Moisturize nails and cuticles, not just hands. Applying a dedicated cuticle oil or a rich hand cream directly to the nail bed and cuticle area, ideally daily, helps maintain the nail’s natural moisture barrier.
• Keep nails at a moderate length and file in one direction. Sawing back and forth with a nail file creates micro-tears in the nail plate that contribute to splitting over time.
• Give nails a break from polish and acetone removers periodically. Frequent removal with acetone-based products strips natural oils; alternating with acetone-free removers or taking short breaks between manicures allows the nail to recover.
• Wear protective gloves for chemical-heavy tasks, including gardening and using cleaning products, both of which are common under-recognized sources of nail damage. For products to support these habits, browse the nail concern collection.

Gel Manicures, Acrylics, and Nail Damage

Gel polish and acrylic extensions are common sources of nail complaints, though the damage usually comes from the removal process rather than the product itself. Peeling or picking off gel polish, rather than properly soaking it off, frequently takes several layers of the nail plate with it, leaving nails visibly thin and weak.

If gel manicures are a regular habit:

• Always have gel or acrylic professionally removed rather than peeled off at home
• Consider a break of a few weeks between sets to let the nail plate recover
• Apply cuticle oil daily even between manicures, since gel and acrylic application steps (buffing, filing, UV curing) can be additionally drying
• Watch for early signs of thinning (increased flexibility, visible layering) as a cue to pause rather than continue

Does Diet Actually Affect Nail Health?

Nails, like hair, need adequate protein and specific micronutrients to grow normally, and severe deficiencies (in iron, biotin, or zinc, for example) can show up as brittle or slow-growing nails. That said, in someone with an otherwise balanced diet, taking additional supplements is unlikely to meaningfully improve nail strength beyond what a consistent topical care routine already achieves. Biotin supplementation, specifically, has more consistent supporting evidence for people with a diagnosed deficiency than for the general population, so a conversation with a doctor is worthwhile before starting a new supplement specifically for nail concerns.

Iron deficiency, in particular, is associated with a specific nail change called koilonychia, where nails become thin and develop a concave, spoon-like shape. This is a useful example of why sudden or unusual nail changes are sometimes worth mentioning to a doctor rather than treating with topical products alone — the nail can be an early, visible sign of something happening elsewhere in the body. For more on supplement-based support, see this hair fall and supplement guide.

A Simple Weekly Nail Care Routine

• Daily: Apply cuticle oil or a rich hand cream to the nail bed and surrounding skin, ideally after hand washing when the skin is still slightly damp.
• 2–3 times per week: Wear gloves for any wet or chemical-heavy household task.
• Weekly: File nails gently in one direction, and push back (rather than cut) cuticles after softening them with oil or during a shower.
• As needed: Take a short break from polish between manicures, and use an acetone-free remover when possible.
• Monthly: Do a quick self-check for new ridges, discoloration, or changes in thickness, since catching a change early makes it easier to identify a likely cause.

Nail Care Considerations by Life Stage

Pregnancy can temporarily change nail growth rate and texture for some people, due to hormonal shifts; this is usually temporary and resolves after delivery.

Older adults often notice thicker, more brittle nails and more pronounced ridging, partly due to naturally slower cell turnover and reduced circulation with age. Consistent moisturizing remains the most useful home strategy at this stage.

Children generally have faster-growing, more resilient nails than adults, though nail-biting is a common childhood habit that can cause similar splitting and weakness to chemical over-exposure in adults. Caring for a growing family? See our baby skincare basics guide.

Common Mistakes When Caring for Nails

• Cutting cuticles instead of pushing them back. Cutting live cuticle tissue increases infection risk and can damage the nail matrix, the area responsible for new nail growth.
• Using nail strengtheners as a permanent fix rather than treating the underlying cause. Strengthening polishes can help temporarily, but ongoing wet-dry cycling or chemical exposure will continue causing damage underneath.
• Ignoring sudden changes in a single nail. While ridges and mild brittleness across all nails are usually harmless, a change isolated to one nail (unusual discoloration, a dark streak, or separation from the nail bed) is worth a dermatologist visit rather than home treatment.
• Filing too aggressively or too often. Over-filing thins the nail plate and can make brittleness worse rather than better.
• Peeling off gel or acrylic manicures at home. As covered above, this is one of the most common preventable sources of significant nail thinning.

When to See a Doctor

Most brittleness, ridging, and peeling responds to a few weeks of consistent moisturizing and reduced chemical exposure. See a doctor if:

• A single nail shows a dark streak, unusual discoloration, or separates from the nail bed
• Multiple nails develop new horizontal ridges or indentations suddenly
• Nails show signs of infection (redness, swelling, pain, or pus around the nail)
• Nails develop a spoon-like, concave shape
• Nail changes appear alongside other new symptoms (fatigue, hair thinning, or skin changes), which can sometimes point to an underlying health issue worth ruling out

FAQ

What causes brittle nails?

Brittle nails are most commonly caused by repeated wet-dry cycling from frequent hand washing or wet tasks, combined with exposure to harsh chemicals like acetone-based nail polish remover, which strip the nail's natural moisture over time.

Are ridges in nails normal?

Vertical ridges running the length of the nail are very common and generally increase with age; they are rarely a sign of a health problem. Horizontal ridges appearing suddenly are less common and worth mentioning to a doctor.

Can diet affect nail strength?

Severe nutrient deficiencies can affect nail growth and strength, but in someone with an otherwise balanced diet, additional supplements are unlikely to meaningfully improve nails beyond consistent topical care.

How often should nails be moisturized?

Daily application of cuticle oil or a rich hand cream to the nail bed and surrounding skin is a reasonable baseline, more often if hands are frequently in water.

Is biotin actually good for nails?

Biotin has clearer supporting evidence for people with a diagnosed deficiency than for the general population. A doctor can advise whether supplementation makes sense for your specific situation.

When should a nail concern be checked by a doctor?

See a doctor if a single nail shows a dark streak or separates from the nail bed, if multiple nails develop sudden ridging, if there are signs of infection, or if nail changes appear alongside other new symptoms.

Does gel or acrylic manicure damage nails?

The polish itself is usually not the main issue; damage most often comes from peeling gel or acrylic off at home rather than having it professionally removed, which can strip several layers of the nail plate.

How long does a full nail take to grow back?

Fingernails grow roughly 3mm per month on average, so a full nail typically takes three to six months to grow out completely. Toenails grow more slowly, often taking twelve to eighteen months.

Ready to build a consistent nail care habit? Browse the nail concern collection for products to support your routine.