Short answer: denture cleaning tablets and liquid solution clean about equally well. The Cochrane review on denture cleansers found no proven winner between the two. The real differences are persulfate allergens in most tablets, cost over time, and daily mess: a 250ml bottle of Blakmint liquid (£14) stretches to 5 months reused over 6-day batches, while tablets are bought, fizzed and binned one at a time, every single day.
Blakmint's own liquid cleaner was tested under ASTM E2315, the standard lab method for measuring bacterial reduction on dental appliances, at a 20-minute soak, not a number we made up for the label.
Tablets vs liquid, side by side
| What matters | Tablets | Blakmint liquid |
|---|---|---|
| Typical cost | around £6 to £7 a month (e.g. a 54-tablet pack at £12.39 used daily) | From £2.80/month (£14 bottle, up to 5 months reused) |
| Soak time | 10 to 15 minutes, most brands | 5 to 20 minutes routine, one overnight soak max |
| Persulfate free | No. Most contain it, flagged as an allergen on the label | Yes |
| Ultrasonic-bath safe | Not usually stated on the label | Yes, stated |
| Daily waste | One foil sachet opened and binned per day | One bottle, solution reused up to 6 days |
| Taste, per a verified buyer | "Tasted of chlorine" | "So much better" (same reviewer, same mouth) |
Tablet pricing: Kukident 54-tablet pack, £12.39. Review quote: verified Amazon buyer, via Blakmint's product listing.
Why tablets feel like a tiny bathroom party you never asked for
A denture tablet cannot just dissolve quietly. It has to fizz, loudly, dramatically, right in front of you, like it's auditioning for a talent show nobody is judging. You drop it in, it hisses up a volcano of blue foam, and you stand there holding a glass like you've accidentally summoned something.
Here's the part the fizz is covering up: the Cochrane review that looked at every denture-cleaning method actually in use (tablets, enzymes, soaking in general) found weak evidence for any of it, and no clear winner between them. The thing doing the real cleaning work is brushing. The fizz is mostly for show.
Liquid does the same soak, minus the show. No foam, no countdown, no small chemistry experiment on your bathroom sink at 10pm. It just sits there being a liquid, like a flatmate who does their washing up without narrating it.
The ingredient on the tub nobody reads out loud
Persulfate is in most mainstream tablet brands, listed, by name, as a known allergen on the box. CareOne's own packaging says so plainly; so does Efferdent's.
Most people wear it for years with zero issue. Some people get a reaction and spend a confused fortnight blaming their toothpaste, their pillowcase, and possibly the moon, before anyone thinks to check the tablet.
Blakmint's liquid cleaner is persulfate free. That's not a personality quirk, it's an ingredients decision: one less thing to react to, for the people who do react to it.
What it actually costs you, every month, forever
A 54-tablet pack like Kukident runs £12.39 and lasts about 54 days if you use one a day. Call it £6.88 a month, for as long as you own dentures or a retainer, which, statistically, is a while.
A 250ml bottle of Blakmint is £14 and, mixed at the 10% solution and reused across 6-day batches, stretches to 5 months. That's as little as £2.80 a month, and the bottle doesn't generate a growing pile of foil sachets in your bathroom bin, because there isn't one.
Can it go in an ultrasonic cleaner?
Most tablet boxes simply don't say whether they're ultrasonic-safe, which, for anything you're about to run electric vibrations through for ten minutes, is worth checking before you assume. Blakmint's liquid is stated as compatible with ultrasonic retainer cleaners, because it was actually tested there before that claim went on the label.
What we actually tested, not just claimed
We ran the liquid cleaner through ASTM E2315, the lab standard for measuring bacterial reduction on an appliance surface, against a mixed inoculum of four real bacteria strains: Pseudomonas aeruginosa, E coli, Staphylococcus aureus and E hirae. At a 20-minute soak, the result was a 99.99% reduction for the sample tested. That's the same number printed on the bottle, not a rounder one invented for this page.
One verified buyer on Amazon put it more plainly than any lab report could: "The liquid solution is so much better than the standard cleaning one I was given initially that tasted of chlorine." Nobody asked them to say that.
If the fizzing and the sachets have worn thin, the Blakmint liquid retainer & denture cleaner is £14 for up to 5 months of use: persulfate free, ultrasonic-safe, and recommended by orthodontists we work with.
Frequently asked
-
Is it safe to use a liquid cleaner on a metal-containing partial denture?
General dental guidance allows effervescent-style cleansers on metal-based dentures for short soaks (around 15 minutes), while acid-based cleaners are usually advised against on metal. If your appliance has metal clasps or a metal plate, check with your dentist before switching products. This is general guidance, not a claim specific to any one brand. -
How long can I soak overnight, and is that safe?
Blakmint's own instructions call for 5 to 20 minutes for routine cleaning, with an occasional overnight soak when needed, never more than one overnight period before rinsing thoroughly and inspecting the appliance again. -
Is persulfate actually dangerous?
Not for most people, but it's a documented allergen, named on tablet manufacturers' own labels (CareOne, Efferdent). If you've ever had an unexplained mouth or skin reaction after using tablets, persulfate is worth ruling out with a persulfate free alternative. -
Can I reuse the liquid solution, or is it one soak and bin it?
Keep the same mixed solution for up to 6 days in a clean, sealed container. Ideally replace it every 2 to 3 days, and sooner than that if it looks even slightly cloudy or dirty. -
Does the Cochrane review mean cleaning method doesn't matter at all?
No, it means soak type isn't the biggest lever. Brushing removed plaque and killed microbes better than any inactive soak in that review, so the product you pick matters less than whether you're also brushing the appliance, not just dunking it.
Where this leaves you
Neither format is going to out clean the other on its own. The evidence doesn't back that fight. What they don't do equally is cost the same, sit the same in an allergy profile, or leave the same pile of foil in your bin by Friday. If that's the actual decision you're making, now you've got the numbers instead of the fizz.
Want the quick version covering retainers, mouth guards and clip in veneers too? Read Why Liquid Beats Tablets for the full appliance line-up.
Looking for the practical side instead? Our guide to denture tablets covers what's in them, how to use them per the label, and the liquid alternative.