According to E! News, the actor's mouth had to be wired shut after the accident at the weekend.
He slipped at the entrance of his LA home in a puddle of water.
E! News said that the former High School Musical star star, 26, also suffered a gash and was given stitches but that he is expected to make a full recovery.
The schedule to promote his new comedy That Awkward Moment has apparently been put on hold.
Zac recently spent time in rehab.
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A cherished dream is elusive. It will be best to change gear, at least for the immediate future. Pursue a moneymaking opportunity with creative appeal. Getting paid to exercise your imagination will lift your spirits. By the time you finish this assignment, you may be in better condition to pursue your primary goal. A brilliant idea for operating on a shoestring budget will come. At that point, nothing will stand between you and success. Stay calm and take things one step at a time.More