1. Prepare a white square paper, fold it diagonally and open it. Then fold the two sides in half to the crease, as shown in the figure.

2. Fold down the top corner as shown in the figure.

3. Fold the left and right sides inward. Cut out two triangles, which will be the eyes of the skull.

4. Fold the paper in half and cut out a triangle, which is the nose of the skull.

5. Unfold the paper. Start breaking the teeth of the skull mask.

6. Turn the paper over. Fold the bottom corner upward by about 1/5.

7. Fold the corner down, then fold it up and then fold it down. This completes the teeth of the origami skull.