Non-toxic nail polish: what 3-free and 10-free mean, and how to choose

"Non-toxic nail polish" isn't a regulated term, but the labels behind it, like 3-free, 10-free and 21-free, do tell you something useful. If you paint your nails at home, or you're picking out polish for your kids, here's what those numbers mean, how water-based polish differs, which removers to look for, and how to get a manicure that lasts.

What "non-toxic nail polish" really means

Nail polishes are made from solvents that evaporate, a film former that hardens into a shiny layer, resins and plasticizers that keep it flexible, and pigments for colour. Conventional nail polish has long used a few ingredients that many people now prefer to skip, and "non-toxic" or "clean nail polish" is how brands signal that they've left them out.

The catch is that there's no official definition. Each brand decides what goes on its "free" list, so a 10-free polish from one company may leave out different things than a 10-free polish from another. The useful habit is to read the list itself, not just the number.

3-free, 5-free, 10-free and beyond

The numbers started with the "toxic trio," three ingredients that used to be standard in regular nail polish. Formaldehyde is classed as a known human carcinogen, toluene vapour can cause headaches and dizziness, and DBP has been linked to reproductive and developmental harm, so they were the first harmful chemicals brands dropped. As brands removed more, the numbers grew. Here's roughly what each label usually covers:

For a real example, BKIND's 10-free polishes are made without formaldehyde, formaldehyde resin, toluene, camphor, DBP, xylene, parabens, perfumes and animal products. Its newer 21-free list goes further and leaves out ingredients such as benzene, phthalates, cyclic silicones, methyl ethyl ketone, glycol ethers of series E, triphenyl phosphate, bismuth oxychloride and chromium oxide greens.

A higher number generally means a longer list of left-out ingredients. It doesn't automatically mean a polish wears better or suits you better, and a brand with a shorter list may simply count differently.

The number on the bottle is a starting point. The ingredient list is what tells you what's inside.

What's actually in a 10-free nail polish

Turn over a bottle of clean nail polish and the ingredient list can look just as long as a standard nail polish. That's normal: the "free" label is about what's been left out, not about having fewer ingredients. Here's how to make sense of the names you'll see most often:

Most nail polishes, clean or not, still rely on solvents like ethyl acetate, butyl acetate and isopropyl alcohol. They're what you smell when you open almost any bottle, and why it's worth painting your nails by an open window. The difference is that clean nail polish brands leave out the more toxic solvents, like toluene and xylene, and use less toxic solvents in their place.

Nail polish brands we carry, and nail polish made in Canada

Yes, there is nail polish made in Canada. BKIND was founded in Montreal in 2014 by microbiologist Marilyne Bouchard, and it makes its products in Quebec. Its polishes are vegan and cruelty free. Its professional-grade line is 77% plant-based and 21-free, and the shades go on easily and dry quickly. We carry a rotating selection of BKIND colours along with its base coat:

Suncoat, from Guelph, Ontario, is the other Canadian name on our shelf. Chemist Yingchun Liu started it in 2002 when her seven-year-old daughter wanted to try nail polish, and it's made in the brand's own facility in Guelph. It takes a different approach with water-based polish (more on that below). If you came here looking for Upfront Cosmetics, the New Brunswick maker is best known to us for its sulphate-free shampoo and conditioner bars rather than nail polish.

Plant-based formulas

Some non-toxic nail polishes now use a plant-based formula, meaning a share of the ingredients, often the solvents and film formers, come from plants rather than petroleum. BKIND's colours are 77% plant-based. Some clean formulas also add a little shea butter, avocado or other plant extracts. Treat the percentage like the free number: useful, but only part of the picture.

Water-based nail polish

Water-based nail polish swaps most of the solvents for water. Suncoat polish is about 70% water, which is why it has almost no smell. Because they use far less solvent, water-based polishes also release fewer volatile organic compounds (VOCs) while they dry. Many water-based polishes also peel off, so you don't need nail polish remover at all. That makes them a favourite for kids and for anyone who finds the smell of traditional nail polish hard to take.

The trade-off is wear. Water-based and peel-off polishes are gentler but usually less chip resistant than solvent-based polish, so think of them as a few-days manicure rather than a two-week one. Thin coats, with each one fully dry before the next, make the biggest difference.

SuncoatHoliday Evergreen Nail Polish DuoTwo 5 mL bottles of water-based, peel-off polish in Sparkling Snow and Going Green.Shop →

Gel polish and the nail salon

Gel polish lasts longer because it hardens under a UV or LED lamp. That curing step relies on photoinitiators, and TPO is one that some brands now leave out, so check the ingredient list if you're buying gel. Air-dry polish doesn't need a lamp at all. Gel also needs soaking in acetone to remove, which is hard on natural nails if you do it often.

The most low-key way to get your nails done is usually at home: air-dry polish, an open window and a gentle remover. If you love a nail salon visit, it's fine to ask about ventilation and whether you can bring your own bottle.

How to apply non-toxic nail polish for a chip-resistant finish

Clean polishes can wear just as well as conventional polish when the nail prep is right. If you're trying a new shade or brand, paint one nail first and see how it wears for a few days. This is the routine we suggest:

1. Start with bare, dry nails. Remove old polish, wash your hands, and wipe each nail with a little remover or isopropyl alcohol so there's no oil or lotion left. Polish grips clean natural nails best.
2. Shape and tidy. File in one direction and gently push back cuticles after a shower, when they're soft.
3. Apply a base coat. One thin layer gives colour something to hold onto and helps keep darker shades from staining.
4. Paint two coats of colour. Keep each coat thin and wait a few minutes in between. Two thin coats beat one thick one, and some sheer shades need multiple coats. A few opaque shades cover in just one coat.
5. Cap the tip. Run the brush lightly along the free edge of each nail. It's the spot that chips first.
6. Finish with a top coat. It adds shine and a chip-resistant layer. Add a fresh layer of top coat every few days and polished nails last a bit longer.
7. Give it time. Polish feels dry in minutes but stays soft underneath for hours, so skip hot baths, dishwater and steam for the first hour or so.

BKINDNail Polish Base CoatA clear base coat that gives colour a smooth surface to grip; also wearable on its own.Shop →

Nail polish remover: acetone-free and natural options

Classic nail polish remover is acetone, which works fast but dries out nails and the skin around them. Acetone-free removers often use ethyl acetate instead, sometimes with an oil like jojoba added to soften the drying effect. A natural nail polish remover is usually one made with plant-derived solvents, such as ethyl acetate from grapes, propanediol from corn and grain alcohol.

1. Soak, then hold. Wet a cotton pad, press it on the nail for about ten seconds, then wipe from base to tip.
2. Be patient with glitter. Leave the pad on a bit longer rather than scrubbing.
3. Wash and moisturize. Wash off any residue and finish with a cuticle oil or hand cream.

Between manicures

Giving your nails a few polish-free days and a little oil keeps them comfortable through a Nova Scotia winter. Jojoba and avocado oils help keep cuticles soft and nails flexible, so they're less likely to split and peel. These are two small things worth keeping by the sink or in your bag:

Questions we get a lot

What does 10-free mean in nail polish?

It means the brand has left out ten ingredients it considers undesirable, usually the "toxic trio" plus formaldehyde resin, camphor, xylene and a few others such as parabens or fragrance. Brands choose their own lists, so check which ten.

Is there any chemical-free nail polish?

No. Everything, water included, is a chemical. What you can find is polish made without specific ingredients you'd rather avoid, and water-based polish with far fewer solvents.

What is the safest non-toxic nail polish?

There's no single answer. A brand that publishes its full ingredient list, a "free" list that matches what you want to avoid, and painting in a well-ventilated room are the practical steps. Water-based polish is the gentlest option for kids.

Which nail polish brands are made in Canada?

Of the brands we carry, BKIND is made in Quebec and Suncoat is based in Guelph, Ontario.

Which brands of nail polish are TPO-free?

TPO is used to cure gel polish under a lamp. Air-dry polishes like BKIND and Suncoat don't need a lamp. If you use gel, check the ingredient list or ask the brand.

How long does clean nail polish last?

Most non-toxic nail polish lasts somewhere between three days and a week, and sometimes longer, with a base coat, two coats of colour and a top coat. Water-based and peel-off polishes usually last a bit less.

Is non-toxic nail polish as good as other nail polishes?

Today's clean formulas apply, dry and shine much like other nail polishes. The biggest difference in wear usually comes from prep, thin coats and a good top coat rather than from the free number.

What's the best nail polish brand?

The best one is the formula and finish you like wearing, from a brand whose ingredient list you're comfortable with. We're happy to show you what's on the shelf.

Nail polish and nail care are in our beauty and personal care section at both stores: 486 Starboard Drive in Bedford and 590 Portland Street in Dartmouth, open seven days. For hands that need more than a cuticle oil this winter, read our guides to body lotion, cream and balm and tallow balm, or see how to use castor oil on dry cuticles. In HRM, order by 11 am with Luminate Express for same-day delivery, or choose pickup. Anywhere else in Canada, orders over $80 ship free.

Sources: California DTSC nail product testing (2012); BKIND, About Us; Suncoat, About Us; Huddle, on Upfront Cosmetics. This article is general information.