Hello doctor my mom is 47 years old she used to get blood in saliva in the morning when she spits. But now whenever she spits she gets blood in saliva. We took all the blood examine of TB CT ENT scan etc everything is normal. So yesterday she took teeth cleaning and scaling as dentist said its a gum infection. But still she experiencing blood in saliva we are very much scared. Pls suggest us what to do? Is it dangerous?