There seems to be an aire of definance in "I hold it back / and keep it sugarless," when compared to the notion that this person could otherwise have some right to complain, or has just come to realize she/he's "over it." I picture this being about a romantic relationship, possibly from the point of view of someone having come out of one bruised and now teetering on the cusp of going back in for another... unexpectedly; so let's put on a smile ("teeth like stars") and see with guarded optimism ("I hold it back") what might happen with this sudden adventure's materialization.
There seems to be an aire of definance in "I hold it back / and keep it sugarless," when compared to the notion that this person could otherwise have some right to complain, or has just come to realize she/he's "over it." I picture this being about a romantic relationship, possibly from the point of view of someone having come out of one bruised and now teetering on the cusp of going back in for another... unexpectedly; so let's put on a smile ("teeth like stars") and see with guarded optimism ("I hold it back") what might happen with this sudden adventure's materialization.