Step one:
Draw two arcs first.
Step 2:
Then draw two intersecting arcs to connect them.
Step 3:
Next, draw a convex curve to serve as the root of the tooth.
Step 4:
Besides, draw a few more tooth shapes like this.
Step 5:
Add a little expression to him.
Step 6:
And add your favorite props or decorations.
Step 7:
Finally, apply a nice color and the teeth are ready.