Toothy Shell Mouths




About: After discovering several electronics dumps at my school (termed "computer graveyards") I started collecting various electronics, like monitors, CD drives, LEDs, fans, and other miscellaneous thing...

I was walking on the beach over the summer and saw a small, flat-ish white rock. It was oddly tooth-shaped. "Huh", I thought, "I could collect a full mouth of tooth-rocks! Even better, I could put those teeth in a shell mouth and use them for Halloween or something!"

And thus this project was born. Enjoy!

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Materials & Tools

  1. Small tooth-sized rocks (32 per "mouth")
    1. Incisors (x8)
    2. Canines (x4)
    3. Molars (x20)
  2. Matching set of shells (2 per "mouth")
  3. Hot glue gun

Step 2: Assembly

Start by gluing the incisors (the small/flat rocks) in the front-center of each of the shells (4 per shell).

Then glue the canines (the pointiest rocks) on either side of the incisors (2 per shell).

Finish by gluing the molars (the widest/flattest rocks) on either side of the canines (10 per shell).

Step 3: Positioning

Hold the final, glued shells together, matching up the "teeth" on the top and bottom in various degrees of openness to determine at which angle your "mouth" looks the best (worst?).

Once you find a good angle, glue any combination of the back-most molars, back corner of the shell, and front teeth in place, whichever happen to match up in the angle you choose (the more glued together, the more stable).

Holding the shell-mouth face-down and gluing from the back corner (the part where the shell attaches normally) will allow you to glue the teeth together from the inside without having any excess glue show on the outside/front.

Step 4: Diversify

All mouths are different! Make your Halloween collection have a full range of sizes, expressions, and quality of dental care as you can!

Halloween Contest 2018

Participated in the
Halloween Contest 2018

Be the First to Share


    • Book Character Costume Challenge

      Book Character Costume Challenge
    • Made with Math Contest

      Made with Math Contest
    • Multi-Discipline Contest

      Multi-Discipline Contest

    5 Discussions


    11 months ago

    bwahaha my 6 y.o. son gonna love making this! :D
    maybe i'll add some pink dyed salt dough or something to make the gum...

    3 replies

    Reply 11 months ago

    I was thinking about how I'd go about making gums... silly putty, fun tack,... let me know how the dough or whatever you go with turns out!!


    Reply 10 months ago

    here's the result ! we made some salt dough, colored with red gouache. i did the samml one, my son did the big one. we just had to plant the teeth in the gum. i sprayed some varnish so as the salt dough doesn't melt (it's baked, but still) , and it also allows better the teeth to stay in place. there was more dough than enough, so we used the leftover to make a tongue... they're like "BWAAAAAAAAAH!!!", happy as a clam! :D


    Reply 10 months ago

    Ack they look great!! well done with the gums and tongues!


    11 months ago

    Those rocks are toothy! I'll have to pick some up next time I'm at the beach :)