Introduction: Concrete Smiling Stones

Picture of Concrete Smiling Stones

Did you just do a double take?! Yup, this is not your typical halloween decor but it's perfect as it will create some giggles and maybe even screams! Better yet, they will last forever since they are concrete and are so easy that you can make a bunch for pennies once you have the mold. I have a lot of unique concrete projects on my site:

Step 1: Step #1 - Gather Your Supplies and Cast Your Teeth

Picture of Step #1 - Gather Your Supplies and Cast Your Teeth

You will need:

  • Denture Shape silicone ice mold
  • RapidSet Cementall concrete or similar (mixing tools/vessel, gloves & dust mask)
  • 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

If you are new to concrete crafting I have a 'tips and tricks 'page on my site to get you started

Step #1: Make the teeth
Mix a small amount of the concrete mix with water (use caution and wear gloves and a dust mask when working with concrete). 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. It can be mixed in a fairly fluid consistency. Fill the silicone molds and tap well to remove the bubbles in the teeth and have the concrete flatten.

It will be unmoldable in one hour.

Step 2: Step #2 - Paint the Teeth

Picture of Step #2 - Paint the Teeth

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…

Step 3: Step #3 - Glue Top to Bottom

Picture of Step #3 - Glue Top to Bottom

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 with hot glue.

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

Step 4: Step #4 - Making the Form & Zipper

Picture of Step #4 - 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 5: Step #5: the Concrete

Picture of Step #5: 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 6: Step #6: Finishing the Colour

Picture of Step #6: 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. You could also just paint it on.

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

Laugh out loud! These guys make me chuckle.

Step 7: Step #7 - Place Them in Great Spots...

Picture of Step #7 - Place Them in Great Spots...

So, now what? You can put them in the garden, add them discreetly between the rockery and make someone jump. Halloween is perfect to add them to the garden or anywhere to surprise people. Even in planters. Concrete is such a great media since it is easily obtainable and does not need fancy tools.

Check out my site for many more DIY projects or Concrete Projects


AMbros Custom (author)2017-11-28

it looks so creepy.Amazing idea soon i will try..

JaredB84 made it! (author)2017-11-20

My kids and I made one for Halloween.

deluges (author)2017-11-20

Oh god why

This is crazy cool

sue.donim.144 (author)2017-11-14

put speakers inside... you can have them sing !

MadeByBarb (author)sue.donim.1442017-11-19

Ah yes, that would be amazing!

ZaneEricB (author)2017-11-17

SO... I need these in my life... like about 1000 of them... THESE ARE INCREDIBLE

3parksdesign (author)2017-10-21

Extremely clever and creepy - I love them! Great instructable - adding this one to my concrete project to do list.

MadeByBarb (author)3parksdesign2017-11-14

There'a many more unique projects on my site:

3parksdesign (author)MadeByBarb2017-11-14

Yes there are! Already checked it out. Thank you.

theartfulbirder (author)2017-10-21

Wow great idea! Perfect Halloween decor!

I am going to leave mine in the rock garden all year... and see who is paying attention.

struno (author)2017-10-22

I wonder if using false teeth would work...?

MadeByBarb (author)struno2017-11-14

Oh yes! But who are you going to steal them from?!

Gofish (author)2017-10-22


MadeByBarb (author)Gofish2017-11-14

Thank you so much!

ziogio1961. (author)2017-10-22

Just love them Barb ! I'm a 56 year old "procrastinating" wanna be "maker". Really like how gives anybody the chance to get outside of their comfort zone and enjoy projects like yours. Thanks for posting !

MadeByBarb (author)ziogio1961.2017-11-14

Thanks, do check out my site for more unique stuff.

BLASTFEMI (author)2017-10-22

So creative and creepy! I love it!

MadeByBarb (author)BLASTFEMI2017-11-14

That's what Halloween is for!

dvrnhll (author)2017-10-22

Great 'ible! I still can't get over the fact that they killed you off on "Stranger Things"... Save Barb!!!

MadeByBarb (author)dvrnhll2017-11-14

You aren't the first who told me that!

sue.donim.144 (author)2017-10-22

it seems it could be taken a step furyher by inserting weatherproof speakers and hooking to an audio source ... have individual recrdings to make them talk. or have a bunch be right side and others be left side of music output source . or have them hooked up to a source you control with mutiple outputs for talking. even with hidden people with microphones .

MadeByBarb (author)sue.donim.1442017-11-14

Oh, I I could understand all that... adds a whole new dimension!

Cris DIY (author)2017-10-23

funny idea! :) voted!

MadeByBarb (author)Cris DIY2017-11-14

Awesome Thanks!

RonB2 (author)2017-10-23

These would make a fantastic geocache.

MadeByBarb (author)RonB22017-11-14

Oh yes! for sure! And they last well.

wyldecent (author)2017-10-23

Creative but distrubing :-)

MadeByBarb (author)wyldecent2017-11-14

Yup, sometimes I have to just go with what comes in my head...

alexkirlian (author)2017-10-23

kkkkk Que horrível !

MadeByBarb (author)alexkirlian2017-11-14

I think I know what you said! :-)

itscbiz (author)2017-10-23

wow, this is so cool!

MadeByBarb (author)itscbiz2017-11-14

Thanks! I love seeing the reactions!

drwebster (author)2017-11-13

very awesome

kylegilbert (author)2017-10-31

I love these! They look so weird and creepy. Great ible!

Wallythecat (author)2017-10-26

Too weird!, I love it. Just received my tooth mold from Amazon, that feels like a quality product. It's in the freezer full of water right now. But further down the road, I'm sort of seeing a Cheshire cat looking thing in my future. I love the inspiration. Thank you. .

By the way, Amazon also has fang molds.

chefspenser (author)2017-10-26

Bravo. I might be concerned if used outside about the open mouth collecting assorted creatures, ants and bugs. I think I will close it up.

Thank you very much for sharing. Will visit your online projects!

blind oly (author)2017-10-25

Do you have any for sale?

dawn_ee (author)2017-10-22

This is awesome! Can't wait to try and hide some of these in our gardens. We have what we like to call "grandkid traps" ..... we hide fun things for them to find when they visit. This will be a perfect addition.

framistan (author)dawn_ee2017-10-25

I saw a quotation on a grade-school wall. It said, "The cure for boredom is curiosity. There is no cure for curiosity." Dorothy Parker (kids that are curious will not ever get bored.

MadeByBarb (author)framistan2017-10-25

I agree! I can proudly say that I am never bored. I always have some idea brewing in my head. The challenge is making people understand how to manage their ideas and let their creativity come through...

MadeByBarb (author)dawn_ee2017-10-22

Oh, that would be fun! I added some to my rock garden at the sidewalk...

SomchaiP1 (author)2017-10-24

Good idea.

Freakyfoam (author)2017-10-24

Thank you. My friends and family think I come up with really weird projects. I can now show them this and seem more normal. LOL

MadeByBarb (author)Freakyfoam2017-10-24

Well, yes I sometimes feel a bit odd too! "What is she doing now?! She's in the back mixing concrete again..."

danthemakerman (author)2017-10-22

These are soooo cool!!!

brainscan (author)2017-10-22

Cool idea, would be great if you had a mould of some lower teeth rather than using the upper set for both.

MadeByBarb (author)brainscan2017-10-22

That's funny, I never noticed! The mold I used is for ice cubes actually.

DonCenzo (author)brainscan2017-10-22

All the rocks with teeth that I've ever seen have two sets of "upper" (human) teeth! That's because they've evolved to be photogenic, right side up, or upside down. lol

I can see giving these to certain "special" acquaintances for paperweights, neatly inscribed with "Bite me!"

keyyman2 (author)2017-10-22

Another option for style of teeth?

About This Instructable



Bio: Welcome! Pleased to meet you, I am Barb; a “Maker”. I have been making things AND explaining how to make things for as long as ... More »
More by MadeByBarb:Concrete Smiling StonesDIY Concrete Faux Geode LampDIY Miniature Terrarium Waterfall
Add instructable to: