I filled my cracked July concrete driveway gaps with Fixodent denture cream and crushed Flintstones vitamins every morning for 14 days. This is what happened

Every July, when the heavy summer heat settles over the driveway, it seems like every little flaw in a slab of concrete decides to open up just a little bit wider. Suddenly, I start noticing all those pesky cracks that I happily ignored all winter long. This year, after hearing one of those too-clever “home fix” notions floating around the internet and neighborhood chatter, I decided to try something frankly ridiculous.

I committed to filling the narrow gaps in my old concrete driveway with Fixodent denture cream and crushed Flintstones vitamins once each morning for 14 straight days. If you’re reading this because you’ve seen a similar claim online and you’re wondering whether it actually works, I’ll save you some of the suspense right now: what happened was incredibly interesting, very messy, a little expensive, and not at all a real repair.

I’ve spent enough years in a rural Midwestern kitchen and working around an old farmhouse to know the difference between a genuinely thrifty trick and a complete waste of good money. Sometimes, oddball remedies actually surprise you and work brilliantly. Other times, they just leave weird orange streaks all over your concrete and teach you a valuable lesson about cutting corners. Throughout this two-week test, I kept careful notes on the temperature, texture, cost, smell, appearance, and what happened after the mixture was exposed to the harsh sun, morning dew, and a light rain.

Here is exactly how I did it, what changed day by day, and what I would tell any neighbor before they even think about squeezing denture cream into a driveway crack.

1. Why I Tried This Experiment in the First Place

My driveway is an older, poured concrete slab that is likely close to 30 years old. It has plenty of character, which is a polite way of saying it has several surface cracks near the apron and two longer gaps running right across the main parking area. This is the exact spot where the summer sun beats down the hardest from about 11:00 a.m. to 5:00 p.m. In the peak of July, those cracks looked especially dry, thirsty, and open. They were roughly 1/8 inch wide in the narrowest spots and closer to 1/4 inch in the widest points.

None of them were deep, structural canyons that threatened the foundation, but they were definitely big enough to catch blowing grit, sprout stubborn weeds, and make the whole entrance to my home look incredibly tired and worn out.

I’d heard the wild claim that denture adhesive could somehow “bind” a crack and that crushed chewable vitamins would somehow magically harden the mixture or add essential building minerals to the concrete. Now, I will be honest—I was incredibly skeptical from the very first breath. Still, I’ve lived long enough to know that some old-time, bizarre experiments are actually worth trying at least once, if only so you can finally stop wondering about them. My thinking was simple: I would test this method on a small, limited section of the driveway, measure the results with my own two eyes, and refuse to pretend nonsense is wisdom if it plainly isn’t.

2. The Exact Materials (and Costs) I Used

If you are going to do a ridiculous experiment, you have to keep track of your supplies. Over the course of the two weeks, I used:

• Denture Cream: Two 2.4-ounce tubes of Fixodent Original denture adhesive cream. At my local store, they were $5.79 each, bringing that part of the cost to $11.58 before tax.

• Vitamins: One 60-count bottle of Flintstones chewable vitamins, which set me back $9.49.

Every single morning, I crushed 2 to 4 of these vitamin tablets using the heavy bottom of a glass mason jar on a small saucer. I ground them up until they became a coarse, colorful powder with a few stubborn granules left behind.

I also utilized some basic household tools: a whisk broom, an old butter knife from the kitchen drawer, a plastic spoon, a sturdy shop brush, a dustpan, and about 2 cups of plain tap water over the two weeks for very light cleaning.

The test area I focused on covered about 6 linear feet of crack. If anyone out there imagines that this is a cheap, budget-friendly substitute for proper crack filler, the numbers already tell a very different story. For much less than the cost of this goofy experiment, I could have easily gone to the hardware store and bought a basic tube of real concrete crack sealant specifically made for outdoor use.

3. How I Prepared the Driveway Section

Before officially starting on Day 1, I took the time to sweep the test cracks thoroughly. I used the tip of my old butter knife to loosen up any tightly packed dirt and grime. I pulled out two tiny, stubborn weeds by the roots, brushed away the loose sand, and let the entire area dry completely in the summer air. The morning temperature on that very first day was a comfortable 74 degrees by 8:00 a.m., and the concrete was already starting to warm up beneath my feet. By midafternoon, it reached a blistering 91 degrees.

It is important to note that I did not pressure wash the area. A true, professional repair desperately needs a much cleaner bond surface than what I provided here. Still, I specifically wanted to mimic what a typical, everyday person trying a “quick hack” might actually do on a Saturday morning. The crack edges were dry, a little dusty in spots, and slightly crumbly. In other words, it was the perfect, fair test environment for a genuinely bad idea.

4. My 14-Day Routine, Step by Step

Consistency is key in any experiment. Each morning between 7:30 and 8:15 a.m., I went out to the driveway. My routine looked like this:

• Sweep: I lightly swept the crack to remove overnight debris.

• Apply the Paste: I squeezed a narrow bead of the Fixodent cream directly into the concrete gap.

• Add the Powder: I sprinkled my freshly crushed Flintstones vitamin powder right over the top of the cream.

• Tamp it Down: I firmly pressed the mixture down using the back of the plastic spoon or the flat edge of the butter knife, making sure it sat just a little below flush with the concrete surface.

On the wider sections of the crack, I found myself adding a second dab of denture cream just to help hold the dry powder in place.

On average, I used about 1 teaspoon of denture cream and 2 crushed vitamins every single day to cover the full 6-foot section. On Days 9 through 14, I had to use a bit more material because some of the earlier applications had visibly shrunk or washed out, especially in those wider 1/4-inch portions. The whole daily process took me about 8 to 12 minutes each morning, and that doesn’t even include the time I spent crushing the vitamins indoors and washing the sticky residue off my hands afterward.

5. What it Looked Like on Day 1

Freshly applied, the mixture looked exactly like what it was: an off-white paste generously dusted with a chalky, orange-yellow powder. Once I pressed it into the concrete, it closely resembled a weak, sad icing rubbed into a sidewalk seam by a distracted toddler. The denture cream itself had a smooth, slightly glossy finish right out of the tube, while the crushed vitamins instantly dulled the surface and gave it a very grainy, unnatural texture.

Within just two hours of sitting in the full sun, the material skinned over. However, it did not cure hard like actual masonry filler. Instead, it became tacky and sticky on the surface and felt distinctly rubbery underneath. Around noon, I touched a little test dab at the edge with a small twig. Instead of resisting the pressure, the mixture dragged and smeared. That was my very first clear, undeniable sign that this concoction was not going to set up in any meaningful, structural way.

6. What Changed by Days 3 Through 5

By the time the third morning rolled around, the narrowest sections of the crack still looked like they were partly filled, but the surface of the mixture had sunken in by roughly 1/16 of an inch. The wider sections were faring much worse; they had developed tiny pull-away lines all along the crack edges, which clearly meant the material was shrinking and completely losing contact with the concrete walls. Furthermore, some of the vitamin powder had blown loose in the breeze and collected in pale orange dust piles along the side of the slab.

Days 4 and 5 brought even hotter weather, with afternoon temperatures soaring between 88 and 93 degrees, baking the driveway hard. That intense heat made the denture cream noticeably drier on top, but it was still far from truly hardened. In one specific section where a car tire happened to roll within 3 inches of the repair, the edge of the cream picked up a bunch of grit and turned a dingy, ugly gray. It was rapidly beginning to look less like a filled crack and more like someone had accidentally dropped their medicine and toothpaste on the ground and tried to hide the evidence by tamping it in with a spoon.

7. What Happened After a Light Rain and Morning Dew

On Day 6, nature decided to intervene. We had a light overnight rain—less than 1/4 of an inch—which was followed by a very heavy morning dew. That moisture was the absolute turning point of the entire experiment.

The material sitting in the shallower portions of the crack turned completely soft and mushy at the surface again. The crushed vitamin powder, which had previously given me a false impression of body and bulk, turned completely pasty in some places and simply vanished in others. To make matters worse, a few little streaks of diluted orange washed 6 to 10 inches downhill, staining the surrounding concrete.

I’ve seen enough outdoor building materials in my lifetime to know that water always finds the truth quickly. Proper concrete patching products might require dry conditions during application, but once they cure, they are built to live outdoors and fight the elements. This denture cream mixture behaved exactly like something that desperately wanted to stay inside a temperature-controlled bathroom cabinet, not out on an exposed driveway under the weather. After that one damp morning, I was forced to refill nearly one-third of the entire test area.

8. The Smell, Texture, and General Unpleasantness

Now, this is the sort of honest, gritty detail that people conveniently leave out when they’re making a video trying to make a foolish trick sound clever.

Denture cream usually has a very clean, slightly medicinal smell when you are indoors. But out in the baking summer heat, mixed with crushed vitamins and driveway dust, it takes on a faintly sweet, stale, and highly unusual odor. It wasn’t terrible, exactly, but it was odd enough that every single time I walked past that part of the driveway, my nose noticed it. By Day 7, the warmed-up patches had developed a gross, gummy look that seemed to act like a magnet for fine debris.

The texture was honestly even worse than the smell. When the sun dried it out, it was chalky on top and weirdly sticky just beneath the surface. When it was damp from the morning dew, it got terribly mushy. When you pressed on it, it dragged and smeared. It absolutely never reached that reassuring, rock-solid firmness you want to feel underfoot or when sweeping with a broom. I would strongly advise against letting pets walk through it, and I certainly wouldn’t want curious children poking at it, mostly because it looked way too much like a bizarre hybrid between candy powder and sticky window caulk.

9. Whether it Actually Sealed the Cracks

In the most generous, forgiving sense possible, this mixture temporarily masked a few of the absolute narrowest surface gaps. If all you mean by “worked” is that for a brief 24 to 48 hours a shallow crack looked slightly less open from a distance of 10 feet away, then yes, I suppose it did something.

But let’s be real: it did not seal against moisture in any durable way, it completely failed to bond strongly to the concrete edges, and it absolutely did not remain stable under the sun and dew.

I decided to test the bond by checking one section with the tip of a thin wooden craft stick on Day 10. The stick easily slipped right under the edge of the filling and lifted up a continuous strip nearly 2 inches long. That immediately told me that water, ice, and grit could get underneath it with zero effort. In a real concrete repair, that sort of edge failure is a total dead end. Once the bond fails and lets water in, the filler is only pretending to help.

10. The Cosmetic Result After 14 Days

By the time I reached the end of the full 14-day run, I can say plainly: the driveway looked significantly worse than when I started.

Those original, simple gray cracks had morphed into an embarrassing patchwork of pale white residue, weird orange specks, dark dirt securely stuck to gummy sections, and incredibly uneven, recessed spots where the material had shrunk away from the edges. Instead of just having simple cracks to deal with, I now had cracks plus colorful discoloration.

In two specific places, the Flintstones vitamins actually left behind faint yellow-orange staining on the concrete that required extra, heavy scrubbing just to reduce. The concrete wasn’t permanently ruined, thankfully, but it certainly wasn’t improved in any way. If a person genuinely hoped this little concoction would blend invisibly into a standard gray slab, that hope would dry up before the first week was even over. Traditional concrete filler may not be glamorous or fun to use, but at least it is chemically designed to cure in a color family that makes sense for a driveway!

11. The Real Cost Compared With Doing It Properly

Let’s look at the bottom line. All in, I spent a little over $21 before tax on the tubes of denture cream and the bottle of vitamins. If I factor in my personal time at even a very modest value—let’s say 10 minutes a day for 14 days—that is 140 minutes, or 2 hours and 20 minutes of kneeling on hot concrete and fiddling with paste.

Meanwhile, a highly effective, decent bottle or tube of real concrete crack sealant in almost any local hardware store runs roughly $8 to $15. Some of the better polyurethane or self-leveling products might run slightly higher depending on the size of the job, but they are still incredibly affordable.

For a 6-foot test crack just like mine, purchasing one proper product and doing one careful, 15-minute application would have easily outperformed this entire exhausting two-week experiment—and likely at a lower overall cost. That’s the exact part of the story my mother would have called “being penny-wise and foolish twice over.” There’s being thrifty and resourceful, and then there’s paying full retail price at the pharmacy just to learn what the hardware store label already knew.

12. What I Learned About Heat and July Concrete

July is an incredibly hard, unforgiving month for makeshift home repairs. My driveway surface was frequently hot to the touch by late morning. The daily cycle of expansion and contraction—shifting between a coolish dawn and a brutally hot afternoon—likely worked against the soft mixture every single day, pulling it apart and pushing it together. A material that softens, shrinks, or entirely loses its grip under heat simply has no business living in a concrete joint that is exposed to direct summer sun.

I did notice that the north-facing crack segment, which happily received partial shade after 2:00 p.m., managed to hold the mixture just a little bit better than the fully exposed south-facing portion. However, even in the shade, the improvement was only relative. As they say, “Less bad” is not the same as good. Outdoor home repairs require serious weather resistance, strong chemical adhesion, and flexibility where appropriate. This homemade combination possessed exactly none of those necessary qualities in any reliable measure.

13. Was There Any Surprising Benefit At All?

If I am trying to be as charitable and positive as possible, I will admit that the sticky denture cream did momentarily hold some loose dust and powder together, and the crushed vitamins acted like a very crude, colorful filler bulk. For a very brief, fleeting time, the crack actually looked filled if you were standing straight up and squinting. That is the only honest “benefit” I can report from this endeavor. It was entirely visual, incredibly temporary, and deeply superficial.

There was, however, one indirect, unexpected advantage: this silly experiment forced me to get down on my knees and inspect the driveway closely every single day. Because I was paying such close attention, I noticed exactly where rainwater was collecting, which specific crack was widening the fastest, and where the worst weeds were most likely to return next spring. In that specific sense, the silliness actually served a highly practical purpose. Sometimes, engaging in a totally failed shortcut is exactly what teaches you where the real, underlying problem begins.

14. How Difficult the Cleanup Was

Cleaning up this mess took vastly more effort than application should ever require for something this totally ineffective. I had to scrape the remaining, stubborn gummy material out of the cracks using a plastic putty knife and a very stiff brush, and then I had to sweep the area repeatedly to get the dust up. The dried, crusty residue clung stubbornly in small patches, especially in the areas where the concrete crack edges were rough and jagged.

I ended up having to haul out a bucket of warm water and a little grease-cutting dish soap, using a heavy scrub brush to tackle the stained, orange spots. Even after all that elbow grease, a tiny trace of color remained until the natural weathering of the sun and rain finally faded it away weeks later.

If I had lazily left the mixture there much longer, I strongly suspect that a lot more dirt, leaves, and road grime would have embedded itself permanently into that sticky adhesive layer. That would have undoubtedly made the driveway look even more blotchy and unkempt. Removing a standard, failed concrete patch is one thing; removing a failed patch that also acts identically to flypaper for road dust is another annoyance entirely.

15. What I Would Emphatically Do Instead

If you find yourself staring at narrow concrete cracks this summer, please save yourself the pharmacy trip.

• Clean thoroughly: Clean the cracks exceptionally well first. Use a powerful shop vacuum if you have one, or at the very least, use a stiff brush and do some incredibly careful sweeping to remove all debris.

• Use the right product: Go buy a crack filler or sealant made specifically for concrete. For hairline and small non-structural cracks, a standard liquid masonry crack filler may be more than enough.

• For wider joints: For wider exterior joints, a self-leveling polyurethane sealant almost always performs better, especially in regions where ground movement and heavy weather are real concerns.

• Read the label: Always follow the temperature recommendations printed on the label, because those instructions are there for a very good reason.

If your driveway cracks are actively widening, look offset, or seem deeper than they initially appear, I would strongly advise having a professional contractor, or at least a knowledgeable local concrete supplier, come out and advise you. In my part of the Midwest, the harsh winter freeze-thaw cycles can easily turn a little innocent gap into a massive, expensive headache in just a season or two. A proper, high-quality repair right now is significantly cheaper than having to replace an entire section of concrete later. And unlike my vitamin-and-Fixodent detour, using real materials gives you a professional result that you don’t have to embarrassingly explain to visitors!

16. My Final Verdict After 14 Days

So, here is the final truth: No, Fixodent denture cream and crushed Flintstones vitamins did absolutely not repair my cracked July concrete driveway.

They did not create a durable or safe fill, they did not stand up to the summer heat and moisture, they did not save me any money, and they certainly did not improve the appearance of my property in any lasting way. What actually happened, in the plainest terms possible, is that I created a soft, shrinking, slightly sticky, oddly colored mess that I eventually had to spend an hour cleaning back out of the concrete.

I honestly don’t mind trying the occasional oddball, out-of-the-box idea, because every single home and every family has its own funny stories of “making do” with what they have on hand. Goodness knows I was raised around plenty of practical, clever improvising on the farm. But the best, most enduring lessons from those days were never about stubbornly pretending the wrong material was the right one. They were about using what actually works, taking genuine pride and care in what you own, and learning enough common sense to confidently tell folklore from a real fix.