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!

Step 1: Materials & Tools

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