Hi I recently went to the dentist to do two root canals, when I went for the second stage of root canal(the prepping of the tooth for the crowns) I noticed while the dental assistant was preparing the gums for, as she put it to get a proper impression, I noticed she took up a very large syringe or at least it looked like a syringe, that was filled with a red substance, I noticed it but I just thought it was some kind of medicine for the gum, but because I have anxiety, when I came home I started thinking of it...... My question to you is, is there a red liquid or a red syringe that a dentist uses on the gum or surrounding the teeth area? I know this might sound ridiculous but when I think of the red liquid now I think of blood.