A dentist from Croatia has stunned the nation with a fluoride-free toothpaste alternative that no one expected

A short clip about the toothpaste aisle has been circulating for weeks, and it has done something unusual: it has made people turn a bottle around and read the back of it.

In the clip, a former intelligence officer tells a room that the toothpaste aisle is the most dangerous aisle in the supermarket. Whatever you make of the claim, the reaction to it was immediate. Comment sections filled with the same question, asked over and over in slightly different words:

That question is the interesting part. Because there is an answer, it has been in ordinary use in Japan for decades, and most of the West is only now catching up.

What people reached for first

The first instinct was to switch to whatever said “natural” on the front.

The trouble is that most of those swaps only change what is doing the scrubbing, and scrubbing works on what sits on top of the enamel. The question people were actually asking was about the enamel itself.

What enamel actually is

Enamel is almost entirely mineral — a calcium-phosphate apatite closely related to hydroxyapatite — packed into crystal rods tighter than almost anything else the body produces. And it has no living cells inside it. Nothing divides. Nothing heals. That is why a chip stays a chip.

But mineral is not alive — and mineral moves in both directions.

Every time anything other than water enters your mouth, the surface turns acidic and a small amount of mineral dissolves out of those rods. When the mouth settles, mineral moves back in. That exchange runs all day, every day, in both directions.

Why the balance matters

Enamel loses a little mineral after every acid exposure and takes it back when the mouth settles. What decides the outcome over years is which direction runs ahead.

That is the part you can actually influence — and it is the part almost nothing in an ordinary routine is aimed at. Brushing, rinsing and flossing all do necessary work on what sits on the tooth. None of them is putting mineral back into it. That was never their job.

Where the answer came from

The mineral enamel is built from is called hydroxyapatite. Japan has used it in everyday oral care for decades — which is the whole idea behind it. It is not a stand-in for enamel. It is the same family of material enamel is made from.

Four minutes, and the other twenty-three hours

The man who put it into a spray is an implantologist. An implantologist spends his working life on the far end of this problem — replacing what could not be saved. You do not do that for long without starting to think about the other end.

There is a line he uses with his own patients, and it is the whole reason this is a spray and not another tube:

A toothbrush cannot go to lunch with you. It is not in the car after coffee, or at the desk after a fizzy drink, or in a handbag at nine in the evening. But those are the hours when the mineral is leaving. So he built something for those hours instead — the same mineral, in a format that works when a toothbrush isn't there. It is patent pending.

Dr. Toni Martinčević, DMDImplantologist · developed CariSpray

It's called CariSpray

A hydroxyapatite oral spray, developed by Dr. Martinčević, built on a short ingredient list with no fluoride.

Two or three sprays, aimed at the teeth and tongue, held for five seconds. No rinsing. No waiting.

Alongside the hydroxyapatite there is xylitol, which works on the other half of the problem. The bacteria that drive decay take it in because it closely resembles sugar, then cannot metabolise it. They fill up on something that gives them nothing.

The recorded results: a 62 % reduction in the main cavity-causing bacteria within three minutes, measured in the lab. Over four weeks, 84 % of users reported less staining, 73 % observed less tartar, and 82 % noticed visibly whiter teeth.

It has also been dermatologically tested — a patch test on twenty adults with sensitive skin, recorded as non-irritant and non-sensitizing.

How people use it

1. Shake. A quick shake activates the formula. Best after meals, or any time you want your mouth to feel clean.
2. Spray. Two to three sprays, aimed at teeth and tongue. Hold for five seconds.
3. Done. No rinsing, no waiting, nothing to carry but the bottle.

It fits in a pocket, and it is safe to swallow — which is why people keep one at a desk, one in a bag, and one by the bed.

Why most people take the set

It is also why the multi-bottle sets are what most people take. The regular price of a single bottle is €39.99. Bought as the six-month set, the same bottle is €19.99 — exactly half.

And because the whole idea rests on mineral arriving regularly rather than once, the people who get the most out of it are the ones who never run out. That is what the delivery option is for, and it works out lower than any one-time price.

The offer

Skip, pause or cancel the delivery option at any time. No minimum, no fee.

If you're still not sure

Every order carries a 60-day money-back guarantee, counted from the day your order arrives. Keep the bottle — sealed, opened or empty, there is nothing to send back. Email us with your order number and we refund the purchase price and the original shipping.

Two months is long enough to know.