This is a complete solution to the island, including spoilers. If you wish to play the game, hints are available at the Poptropica site.
(For the Shark Tooth Island guide on the Poptropica site, see the related link).
SOLUTION :
Collect the three ingredients (the coconut milk is a free sample, but the bone and key ingredient are down in the underground ruins). Get a grass skirt from Booga Bay and wear it, then climb the bamboo "tree" to give the ingredients to the medicine man.
Once the Medicine Man has mixed the Sleeping Potion in the coconut, go to Booga Bay and fire it with the coconut cannon. After Booga swallows it and sinks away, swim out to the small island to rescue the marooned people there, and lead them back to the beach.
(see related solution question)
Get the translation page from the roof of the ruins, and spell "open" to enter the underground door. The bone is beneath the spiked walls, so you will have to climb back up past the fast-moving worm. (The bat character will also tell you about the creature bone.)
(There is a sign that says "Dinosaur Bones Found Here". You will come to a bone which you collect.)
(see related question)
The three ingredients are the coconut milk, the creature bone, and the green Key Ingredient. The coconut milk is free from the vendor, and the bone and green jar are down in the underground ruins.
Get a grass skirt from Booga Bay and climb up to see the Medicine Man (the large rock will help you reach the vine). He will mix the three ingredients into a coconut, and you can fire it out ot the shark using the Coconut Cannon at Booga Bay.
To open the wall to the bone and ingredient chambers, you just need to spell "OPEN" using the ancient letters. There are seven symbols on the "teeth" running left to right. Press the 3rd, 4th, 6th, and 7th symbols*, then press the "nose", and the door will open. You do not need to get the journal page off the roof of the ruins (which is where this code is revealed). (*Counting left to right, the symbols are #3 - triangle down, #4 - box eight, #6 - square backward L, and #7 - maze. Using top and bottom teeth, the selections are second top, second bottom, third bottom, fourth top.)
Steps to complete Shark Tooth Island on Poptropica :
Take the Poptropica blimp to reach all of the islands. The one with the shark on it is Shark Tooth island.
you get on top by moving the block over to the tree(watch out for coconuts!) jumping to the 2nd platform the doing a full power jump. I beat Shark tooth Yah so did I
First get past the shark!
its OPEN
To get the ingredients on shark tooth island,you must open the door in the cave,get the 2 ingredients and go back to the native islander and give him the stuff
open
go on top of the temple and get the paper then go to the door and spell open with the symbols on the piece of paper then the door should open
open
open
open
It is OPEN which is the 3rd 4th 6th and 7th teeth counting from the left. Then you click the nose.
you put open 4 de answer
Spell the word "open" in ancient symbols using the translation page. (see related question)
In the underground ruins on shark tooth island, you need a code to open the stone door. It is the word "open" in the hieroglyphics from Hammerhead's journal. The journal page is on top of the ruins, and you can get it by climbing the vine to the first platform, then jumping left. The word "open" is spelled by pressing the 3rd, 4th, 6th, and 7th symbols from the left, and then pressing the nose.
Use the translation in the ruins to press the four teeth that spell "open", then press the nose to open the door. (see related question)