I've done this not using Mechanism, but by creating a surface of the 'male' tooth and then patterning it at very small increments. The increment size was limited by accuracy / regen issues so the result was a bit facetted, but we actually milled parts (face gears) from the model and they inspected OK and seemed to work fine (in a lightly-loaded actuation application though, not 'proper' power transmission).
