Every three to four weeks. That is the whole answer, and for most people it is genuinely that simple. The more useful question is why the window is that size, what happens when you stretch it, and how to tell whether you need a fill or a fresh set.

The three-to-four-week rule

Fingernails grow roughly three millimetres a month. After three weeks there is a visible band of your own nail at the cuticle where the product ends — small enough that a fill tidies it up neatly, large enough that it has started to be noticeable.

A fill removes the loose product at the base, rebalances the nail, and blends new product into the regrowth. The rest of the set stays where it is. It is quicker and cheaper than starting again, which is the entire point of maintaining rather than replacing.

Why your growth rate matters

Three to four weeks is a range rather than a fixed number because nails do not grow at the same rate for everybody, or for the same person all year.

Nails generally grow faster in warm weather than cold, faster on your dominant hand, and faster on some fingers than others — the middle finger usually outpaces the little finger noticeably. Age slows growth. Some medication changes it.

The practical version: after two or three cycles you will know your own number. If the regrowth is obvious at two and a half weeks, book at three. If you get to four and it still looks tidy, book at four. Once you know, put it in the diary as a standing appointment rather than deciding each time — people who book ahead maintain far better sets than people who book when it starts to bother them.

What happens if you leave it too long

This is where the cost argument turns around. Delaying a fill feels like saving money and generally is not.

As the regrowth band widens, the balance point of the nail shifts. The product is no longer supported evenly from the base, and the whole nail becomes a longer lever with more leverage at the tip. That means:

  • More lifting. The exposed edge at the base catches on things and starts to separate.
  • More cracking. The stress point moves to where the product meets the new growth.
  • More breakages. A poorly balanced nail catches, and a caught nail can tear painfully.
  • Moisture underneath. Where product has lifted, water sits in the gap against the nail plate, and that is the condition in which problems develop.

A fill at R180 or R200 turns into a repair at R30 a nail, or a full new set. The two-week delay rarely pays for itself.

Fill or new set?

A fill works while the body of the set is sound. Come in for a new set instead when:

  • Several nails are lifting in different places rather than one
  • There is cloudiness or discolouration visible under the product
  • The surface has been filed thin over repeated fills and no longer has much substance
  • The shape has drifted so far that rebalancing would take longer than starting fresh
  • You want to change length, shape or style significantly

You do not have to work this out yourself. Book the fill, and if it turns out a new set is the better call we will tell you when we look. There is no advantage to us in doing unnecessary work.

What it costs

  • Gel fill — R180
  • Acrylic fill — R200
  • Nail repair, per nail — R30
  • Soak-off with a new set — R80

Over a year at three-weekly intervals that is roughly seventeen visits. It is worth planning as a running cost rather than a series of individual decisions.

Between fills

Three simple habits noticeably extend the window.

Oil daily. Cuticle oil at the base keeps the natural nail flexible, and a flexible nail lifts less at the product line. Last thing at night is the easiest habit to keep.

Gloves for water. Repeated hot water is the main cause of lifting, and washing up is the main source of repeated hot water.

Check the edges. Run a thumbnail along each nail every few days. If it catches, something has started lifting. Caught early it is a R30 repair; left a fortnight it is considerably more.

Booking a rhythm

The people with consistently good nails are almost always the ones with a standing appointment. Book the next fill as you pay for this one — it takes ten seconds, it costs nothing, and it removes the decision entirely.

Call the nail bar on 073 590 3317.

Toenails follow a different clock

Toenails grow far more slowly than fingernails — roughly a third to a half the rate. A gel toe set will look presentable for six to eight weeks rather than three or four, and there is no need to run them on the same cycle as your hands.

What tends to decide the timing for toes is not regrowth but wear: closed shoes through winter, and the pressure of a shoe on a longer nail. If a toe set has started to catch inside a shoe, that is the signal, whatever the calendar says.

What if you are going away?

Time the appointment for the few days before you travel rather than a fortnight ahead, so you get the freshest part of the cycle while you are away. If the trip is longer than four weeks, say so when you book — we can adapt the length and shape so the set grows out gracefully instead of becoming unwieldy halfway through.

Beaches, pools and sunscreen are all harder on a set than ordinary life. Take cuticle oil with you and use it in the evenings, and rinse chlorine and salt water off your hands rather than letting them dry on.

The short version

Three to four weeks, adjusted for how fast your own nails grow. Book the next appointment while you are paying for this one. Oil daily, wear gloves for washing up, and deal with a lift the week it appears rather than the week after.