BIAB (builder gel) is popular because it is strong and wears well, but no nail treatment lasts forever. Here is what to expect, why some sets last longer than others, and how to make yours go the distance.
The short answer
Most people get around three to four weeks from a set of BIAB before they want an infill. Some go a little longer; others find two to three weeks is their limit. The product itself often stays on longer than that, but regrowth at the cuticle becomes visible and the balance of the nail shifts as it grows.
Compare that with gel polish or shellac, which typically looks its best for around two weeks. For a side-by-side comparison, see what BIAB is and how it compares.
Why regrowth matters
Natural nails grow continuously, on average a few millimetres a month, and faster in summer for many people. As your nail grows, the builder gel moves forward with it. That leaves:
- A visible gap at the cuticle, more obvious with darker colours.
- A shifted apex, so the thickest part of the gel is no longer over the stress point of the nail.
- More leverage on the free edge, which can make the nail more likely to snap.
That is why infills are recommended even when the gel looks intact.
What is a BIAB infill?
At an infill, the technician files back the existing gel to a thin layer, removes any lifting, prepares the regrowth and applies fresh builder gel over the whole nail, rebuilding the apex. It avoids soaking everything off, which is better for the nail plate over time.
If you want a break, the gel can be soaked off instead. Our guide on how to remove BIAB at home explains the method.
Why BIAB sometimes lifts early
If your set lifts or chips within a week or two, it is usually one of these:
- Preparation: oils or shine left on the nail stop the gel bonding properly.
- Cuticle contact: gel applied onto the cuticle or skin lifts as the skin moves.
- Curing: the lamp and product should be matched; under-cured gel is weaker and more likely to cause skin reactions.
- Nail type: very oily or very flexible nails can be harder to bond to.
- Lifestyle: lots of hand-washing, cleaning without gloves, swimming and using nails as tools all shorten wear.
Tell your technician if a set lifts early. They can adjust preparation, product or length.
Aftercare to make BIAB last
- Wear gloves for washing up, cleaning and gardening. Detergents and water are hard on gel.
- Use cuticle oil daily. Hydrated cuticles and surrounding skin help the nail stay flexible and reduce lifting. More on that in how to strengthen nails.
- Do not pick or peel. If an edge lifts, file it gently or book a repair. Peeling takes layers of nail with it.
- Do not use nails as tools for opening cans, scraping labels or prising lids.
- Keep length practical. Shorter nails are less likely to snap.
- Avoid harsh solvents that can dull or soften gel.
How often should you get infills?
Every three to four weeks suits most people. If your nails grow fast or you prefer a fresh look, book every two to three weeks. Leaving it much longer than four or five weeks increases the risk of breaks and makes the next infill harder.
How long can you keep wearing BIAB?
Many people wear builder gel continuously for months with regular infills and no problems. If your nails feel sore, look discoloured or the skin around them becomes itchy or inflamed, stop and seek advice. Skin reactions can be a sign of an acrylate allergy; read our gel nail allergy guide.
Does colour affect how long BIAB lasts?
Colour does not change how well builder gel bonds, but it changes how soon you notice regrowth. Clear, milky and nude shades hide the gap at the cuticle well, so many people stretch them to four weeks or more. Dark or bright colours show regrowth within a couple of weeks. Nail art and chrome finishes can also wear at the tips sooner, especially if you type a lot.
Signs you need an infill now
- The gap at the cuticle catches on hair or clothes.
- An edge has lifted, even slightly; water can get underneath and weaken the bond.
- The nail feels tip-heavy or has started to bend.
- A crack has appeared across the gel.
Booking a small repair at the first sign of lifting is quicker and kinder to the nail than waiting for the gel to break off.
Frequently asked questions
How long does BIAB last on natural nails?
Typically three to four weeks before an infill is needed, depending on how fast your nails grow and how you use your hands.
Does BIAB last longer than gel polish?
Usually, yes. Builder gel is thicker and stronger, so it tends to look good for longer than a thin gel polish, which commonly lasts around two weeks.
Can I leave BIAB on for six weeks?
It may stay on, but by then the regrowth is significant and the nail is unbalanced, which increases the risk of breaks and lifting. An infill around the three to four week mark is better.
Why is my BIAB lifting after a week?
Common causes are preparation that left oil on the nail, gel touching the cuticle, under-curing, or a lifestyle that is hard on the hands. Ask your technician to look at it.