Around 1 month back accidentally I ingested bits/particles of happydent chewing gum which was giving the sensation of being stuck in my throat. I went to a hospital emergency the next day wherein X ray was unable to find anything & the ENT doctor Inserted a handle with a mirror inside my throat but was unable to see anything. Then after I went to two ENT Specialist doctors who ruled out it as a psychological sensation. I was frustrated by the 3rd week & sensation became somewhat dormant. The last ENT doctor performed a Video Laryngoscopy & found a small bit of white material which he suctioned out. But the sensation was still present, now for the last 3-4 days I am trying to cough & few white particles are frequently coming out of my mouth during the coughing bouts & one of the white bits was covered in black color & Foul smell came from my breath. Am I having some sort of lung infection ?? Kindly suggest mode of action as I have been to 4 doctors & now frustrated! Thank you.