The top block of text is an example of Tenacity Regular set in Flash in a static text box at ten pixels height. As you can see, it is crisp and sharp all over because it is completely pixel accurate. The text remains editable even after the file is saved but is converted to outline when it is published.

If the box is a multi-line dynamic text box, it looks the same provided the fonts are installed on the user's system, but this is unlikely.

Only use a dynamic text box if the text has to be modified with ActionScript at run-time. If you must use dynamic text, treat it like HTML text and use fonts available on the user's system.

At the bottom, the example of Tenacity Regular has been set in a multi-line dynamic text box and the font embedded. Embedded fonts lose their pixel accuracy because of the rounding errors introduced by the extra processing. Fractional pixel widths are introduced which progressively take the characters off the screen's pixel grid and cause anti-aliasing. This doesn't matter so much with regular printer fonts that are intended to be anti-aliased, but for pixel fonts, the results are unacceptable.