DIY Concrete Smiling Stones

No, I have definitely not ‘lost my marbles’! This craziness sparked from some recent funny things in my life. And nope, I still have my teeth! But a rainy family weekend away meant playing some games. ‘Speak-Out‘ is so hilariously side-splitting funny; I have not laughed that hard in ages!

I’m not sure how, but that crazy artist brain of mine somehow came up with this DIY Concrete Smiling Stone adaptation when I remembered a mold I had kicking around…

You will need:

  • Denture Shape silicone ice mold
  • RapidSet Cementall concrete or similar
  • Tin foil
  • Hot Glue Gun & glue sticks
  • Duct Tape
  • Acrylic paint (white, black, yellow, blue & red)
  • Clear acrylic Gloss medium optional
  • Acrylic Pearlizing Medium
  • brushes, water
  • metal zippers (longer can be cut) & scissors
  • Palette knife or similar

Step #1: Make the teeth

Mix a small amount of the concrete mix. This RapidSet Cementall sets very quickly; in only a few minutes and does not require as much water. It is recommended to add the water first and then add the dry mix. I’m a bit of a rule breaker so I had been doing it backwards for a while. Then I always needed to add more mix because it was too wet… figures.

The ‘teeth’ parts tends to get bubbles so make sure to tap it very firmly to rid of the bubbles.

The impatient part of me loves that it can pulled out of the mold in one hour. No need for a mold release either as silicone works great with concrete. I am so impressed with this mold, as it is quite realistic.

You could leave it as is or give it some realism by painting it.

To mix a flesh tone mix some white and red acrylic paint, add some yellow, and then a tiny bit of blue. Compare it to the colour of your hands, but a bit more pink.

You can be fussy or not. The inside won’t be seen, nor the back.

I added a bit of gloss medium to make it ‘saliva-shiny’. Even a bit of acrylic pearlizing medium makes the teeth shine. You can’t help but chuckle through this…

To set the upper and lower teeth I separated them a bit and glued with hot glue at the molars. This won’t be seen so be sure it holds well by filling well.

To prevent anything getting in the mouth opening I taped the back closed with duct tape.

Step #2: Making the form & Zipper

Any length of zipper can be used as long as it is enough for the smile. The excess can be cut off. Use some old zippers from discarded clothes, as the colour does not matter. The 2 open ends of the zipper need some gluing together. You can adjust the smile as you like.

Glue the top and bottom at the centre point. I leave the sides loose to build up with some concrete ‘cheeks’.

From my sculpting days I learnt to use tin foil as a bulking agent. It is great since it can be formed easily and is quite stiff. Make the shape you prefer and glue to the teeth. Add more if needed. You can now imagine how it will look. Be creative, as stones come in all sizes and shapes.

I tuck a bit of the foil around the zipper to keep everything snug before I start with the concrete.

Step #3: The concrete

Using the same concrete, this time mix it to a thicker consistency. I find that it will slightly stiffen in about 30 seconds and be quite moldable and able to hold it’s shape. I do really love this stuff…

It’s not a mystery what to do next. Cover the form with the concrete and work your way around. It can be a round type of stone or more angular. Poke it, put dents & holes. The more rough the better and realistic it will look. It will start to get firm after a couple of minutes or so.

At that point I will start to get fussier and finish the ‘lip’ edges. I like to use a painter’s palette knife as it’s thin and flexible. ‘Smear’ the mix up carefully to where the zipper teeth are. You can also brush any concrete off with a brush and water if need be. Try to keep the zipper pull clean.

Trust me, it’s not that hard at all…

Step #4: Finishing the Colour

Yup, I am always in a hurry. I figure if the paint is added earlier it can sink into the concrete even better. I mix a bit of black acrylic paint with a tiny bit of concrete and brush it on very loosely.

Let it run and be mottled. The mix tends to be a very light colour if no staining is done.

Laugh out loud! These guys make me chuckle.

So, now what? You can put them in the garden, add them discreetly between the rockery and make someone jump.

I could not resist seeing them frolic on the beach with their other rock friends…

I would like to plant up a bowl with some succulents and beach stones. Perfect for the orthodontics/dentist office!

And Halloween is fast approaching. Perhaps you just add a few under the house plants to give you a smile every day.

I may be a bit silly… bit we keep using emojis everywhere but these are real ‘stone’. We all deserve a hearty laugh now and then.

I just can’t help myself… A bit of fun before I have to head back to teaching!

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111 Comments

  1. I made some smiling rocks and peeper rocks. How can I share a photo with you. Thanks for the tutorials. They were a lot of fun!

  2. Barb, you make my spooky Halloween dreams come true! I hope my neighbours don’t mind when I become the spooky af house year round.

  3. I just tried to make my first set of teeth and am having “tooth decay” – the front teeth did not stay intact with the rest of the set when I removed them. Any tips? I put the cement into the mold in a sort of wet paste-like consistency. Perhaps I should leave more water in the mix so it can flow into the teeth and then set up? I used QUIKRETE Quick-Setting Cement (Initial set 5-10 minutes, final set in 10-20 minutes).

    Would love to know your troubleshooting advice!!

    1. Oh dear! I used Rapidset Cementall and they were very strong. Maybe try a more fluid-ish mix. Concrete needs the water for the chemical reaction. Also, maybe cure for longer. Sometimes concrete mixes get old and don’t hold as well also; especially if they were stored outside. I hope that helps!

      1. I will try more water and let it cure as you suggested. I will do one more test before I go and buy the Rapidset Cementall.

        I was just too excited to start 🙂 I just couldn’t wait for delivery and it was out of stock in my area.

        I will let you know what happens!

  4. pode usar gesso fica bom também , ou gesso pedra que os proteticos usam fica barato.
    gostei muito de como é feito até

    1. (translated) “you can use plaster, it’s good too, or stone plaster that the prosthetics use is cheap.
      I really like how it’s done”
      – Thanks for the info

    1. I do not think so. The more that the paint sinks into the concrete the better it will last. The problem is red paint typically fades in sun. I have some out in the yard for years just a bit faded gums… 🤷🏻‍♀️

  5. Hi Barb could you use the same techniques and the same products, tin foil and that cement and make a huge troll face or something of that nature for the garden? I’m just having a moment here and would like your advice please,
    I’m going to have a bash at these teeth rocks though hah! They are pretty funny!!

  6. My sister was going through my grandparent’s things and she found a drawer with all their past false teeth. Gross I know, but we have a weird sense of humor. She thought it would be funny if I made something with them for my son whom had recently graduated from dental school. So you answered that call and I’m making one for each of my sisters as well. Thanks for your humor!

    1. Ok, how coincidental… I found a few last week and thought they would be great to keep for some even more detailed rocks. I did also give one to my dentist! Great gift!