No, I have no trouble breathing, only a mild cough and abnormal chest CT. The CT was an incidental finding and my pulmonologist followed me x 2 years. He ordered a culture because the CT was worse, and bingo(!) MAC grew out. By then I was feeling pretty sick with chills and productive cough which are gone now. I was lucky to get a diagnosis before I was very sick. I think i will put off the dentist. I also have Sjogren's which he said damaged my lungs so that I was vulnerable to infection. Thanks for inquiring.