Dental?

A few days ago, I woke up and was horrified to find my hd's mouth red with blood. I was very alarm but decided it is his gum. It bleeds easily. I shot some spray for his saliva and when it disappears by itself at the end of the day, was very relief and decided it is his gum bleeding. This morning I woke up at 1 am and again the same thing, blood in his mouth around the teeth area but a lot more, and it was fresh blood. I looked inside his mouth and did not see any blood. I used the suction machine and cleaned it out. And used a dent tip to clean what I was able to. And then he started coughing, mucus colored with blood flowed to the area at his teeth. I used the suction machine reaching into his throat and saw mucus with streak of blood being suck in. Blood is always unnerving. I lay there unable to sleep till 2 am. I could not wait to tell the hospice nurse about it. She believes it is his gum and asked if he could see a dentist to have his teeth properly cleaned. I told her I saw blood in his mucus going into the suction machine tube. She did not believe me. The doctor came to check on him, routine check. He told her my hd's lungs are clear and he is doing a lot better than he had expected. Hence the dismissal of blood. I tried to tell him about it, he did not pay attention to it. My hd is on antibiotic, it could account for the nurse not taking any action - since he is on antibiotic. I was right about the pneumonia a few weeks ago, I might be right again, the blood is not from his gum.