i am now 2 years post tx. i used a cool mist humidifier for several months during the 1st year post tx and it DID help with the dry mouth. however, i decided to stop using it bc it was putting little black mold spots all over my bedroom ceiling. i didn't want to be breathing mold spores so now i just use evoxac prescribed by my doc and rinse with biotene mouthwash before bedtime.