Daniel Johnson has put together a Palmer Tooth Notation TrueType font called FreePalmer. It is covered by the GPL 3 license. This font is descended from FreeSans. It can be used in OpenOffice and other software. A "MP7" derivative which enables the grid patterns to be produced that correspond to handwritten Palmer tooth notations is available for download as well. The FreePalmer characters are placed in the Latin-1 part, overriding existing characters. A more technically correct way would be to program orthographic ligatures into the font.