In a connective tissue gum graft, how does a dentist stop all the blood flowing into ones mouth when cutting the palate for the tissue?

Surgical Assistant: The surgical assistant will assist your dentist during the surgery. The anesthetic contains epinephrine which helps decrease blood flow at the surgical site, and suctioning the area will also help. You have to remember that your dental providers have thousands of hours of education and that much more in experience. Don't worry about such things.