You do not have to wait as long to reuse your breath weapon as you normally would.
Prerequisites: Breath weapon, Quicken Spell or Quicken Spell-Like Ability.
Benefit: The required interval between uses of your breath weapon is reduced by 1 round. For instance, a dragon with this feat can use its breath weapon once every 1d4−1 rounds instead of every 1d4 rounds. If the 1d4−1 result is 0, the dragon can breathe again in the following round (but not twice in the same round).
If the interval is a fixed period of time, such as once per hour, the interval is halved.
Special: If you have multiple heads with breath weapons, all your breath weapons use the new interval.
Source: Savage Species, page 39.