I Filled My Cracked July Concrete Driveway Gaps with Fixodent Denture Cream and Crushed Flintstones Vitamins Every Morning for 14 Days

I Filled My Cracked July Concrete Driveway Gaps with Fixodent Denture Cream and Crushed Flintstones Vitamins Every Morning for 14 Days—Here’s What Really Happened

Every July, when the summer heat settles over the driveway and every little flaw in the concrete seems to grow just a bit wider, I start noticing cracks I ignored all winter. This year, after hearing one of those too-clever “home fix” ideas making the rounds online, I decided to test it for myself.

The claim? Fill driveway cracks with Fixodent denture adhesive and crushed Flintstones vitamins every day for two weeks, and somehow the mixture would harden into a durable repair.

It sounded ridiculous.

Still, I’ve spent enough years around old farmhouses and repairing things on a budget to know that occasionally an unusual trick turns out to have a little truth behind it. So instead of dismissing it outright, I ran a careful experiment.

After 14 straight mornings, here’s exactly what happened—and why I wouldn’t recommend this method to anyone.

Why I Decided to Try It

My driveway is nearly 30 years old and has several hairline cracks plus a couple of wider gaps where years of freezing winters and hot summers have taken their toll.

The cracks were:

About 1/8 inch wide in most places

Nearly 1/4 inch wide in a few sections

Dry, dusty, and collecting weeds

Since none were structural failures, they made a perfect test area.

I wasn’t expecting a miracle.

I simply wanted to see if this strange internet claim had even a tiny bit of truth behind it.

The Materials

For the experiment I used:

2 tubes Fixodent Original Denture Adhesive

1 bottle Flintstones chewable vitamins

Mason jar for crushing vitamins

Putty knife

Small wire brush

Shop vacuum

Spray bottle of water

Notebook for observations

Total cost came to nearly $22, far more than I expected for such an odd experiment.

Preparing the Cracks

Before applying anything, I cleaned every crack thoroughly.

I:

Pulled weeds

Brushed out loose dirt

Vacuumed debris

Allowed everything to dry overnight

A clean surface gives any filler its best chance.

Day 1

I squeezed a thin bead of Fixodent into one crack.

Then sprinkled crushed vitamin powder over the adhesive.

Immediately I noticed:

Strong mint smell

Bright orange color

Sticky texture

Difficult cleanup

Within an hour the surface became rubbery but never truly hardened.

Day 2

The previous day’s material had shrunk noticeably.

Dust was sticking to it.

The vitamins had turned darker orange.

I repeated the process.

Day 3

Morning dew softened everything again.

Instead of becoming stronger, the material actually became easier to scrape away.

Ants appeared interested in the sweet coating left by the vitamins.

Day 4

The driveway reached nearly 95°F (35°C).

The adhesive softened considerably.

Walking across it left faint shoe marks.

That wasn’t encouraging.

Day 5

Fine sand and dirt had become embedded throughout the repair.

The crack actually looked messier than before.

Day 6

A light rain shower arrived.

After drying, nearly half of the material had washed or crumbled away from wider sections.

Day 7

One week in, I compared untreated cracks with treated ones.

Surprisingly:

Neither crack had changed in width.

The treated crack simply looked orange and dirty.

No structural improvement was visible.

Day 8

Applying fresh adhesive over old adhesive became increasingly difficult.

The layers never bonded together.

Instead they peeled apart like old caulk.

Day 9

Some vitamin particles had faded.

Others had stained the concrete slightly.

The mint smell had disappeared entirely.

Day 10

The afternoon sun caused more softening.

A screwdriver easily scraped away most of the filler.

That confirmed it lacked any real strength.

Day 11

I stopped expecting improvement.

Instead I focused on documenting durability.

Results remained disappointing.

Day 12

The edges collected grass clippings and dust.

The repair looked worse than untreated cracks nearby.

Day 13

Another humid morning softened the material yet again.

Pressing with my thumb left visible indentations.

Real concrete crack fillers simply don’t behave that way.

Day 14

The experiment officially ended.

I removed most of the material using a plastic scraper.

It came out surprisingly easily.

The original cracks remained almost exactly as they had been two weeks earlier.

What Actually Happened

After two weeks:

✅ The mixture temporarily filled shallow gaps.

✅ It reduced the appearance of some small cracks for a day or two.

❌ It never became hard like concrete.

❌ It wasn’t waterproof.

❌ It softened in heat.

❌ It loosened after rain.

❌ It attracted dirt.

❌ It stained parts of the concrete.

❌ It offered no lasting repair.

Why It Doesn’t Work

The explanation is actually simple.

Fixodent is designed to hold dentures against moist gums—not withstand vehicle traffic, UV rays, temperature swings, or standing water.

Flintstones vitamins contain sugars, flavorings, colorants, and nutritional ingredients intended for eating. They contain no cement, epoxy, or mineral binder capable of repairing concrete.

Mixing the two doesn’t create a stronger material. It simply creates a sticky paste that deteriorates outdoors.

What Actually Repairs Concrete Cracks?

For hairline and small driveway cracks, products specifically made for masonry work perform far better.

Depending on the crack size, homeowners typically use:

Acrylic concrete crack sealers

Polyurethane crack fillers

Self-leveling concrete sealants

Polymer-modified repair mortar for wider damage

These products are designed to expand and contract with seasonal temperature changes while resisting moisture and sunlight.

Lessons Learned

Sometimes unusual experiments are worth trying simply to separate myth from reality.

This one reminded me that not every viral “hack” deserves a place in the toolbox.

While the driveway didn’t suffer permanent damage, I spent over twenty dollars and two weeks proving something manufacturers of concrete repair products have known all along: materials designed for teeth don’t belong in pavement.

Final Verdict

Would I do it again?

Absolutely not.

The mixture provided a temporary cosmetic fill at best, but it wasn’t durable, weather-resistant, or cost-effective.

If your concrete driveway has cracks, you’ll save both time and money by purchasing a proper concrete crack filler from the hardware store. It will last longer, look better, and actually protect the concrete instead of creating an orange, sticky mess that disappears with the next rain.

Sometimes the simplest solution really is the right one—and this experiment proved exactly that.