So Adams has been trying other options. Like something called direct voice rehabilitation. It's a kind of voice therapy created by Dr. Morton Cooper that uses humming and breathing techniques to teach people how to speak clearly again.
And though his voice has improved, it's still not back. He told "Primetime" that his voice was in the top 5 percent of its range the day he was interviewed. Adams said he usually has to struggle much more to get his words out.
So now, he's decided to take a drastic "last resort" -- a surgery to re-route the nerves to his vocal chords. It's an operation surgeons have been trying to perfect over the past ten years. There's a risk that it may leave Adams with little or no voice at all. But if successful, it may finally bring his voice back for good. He won't know for months, when the nerves have had a chance to heal.
In the meantime, Adams has discovered an irony in all this. His comic strip characters, Dilbert and Dogbert, are also missing something -- their mouths. But they still have a voice. And he hopes he'll get his back too.
For more information, visit the National Spasmodic Dysphonia Association.