Turmeric has applications in countless health conditions, but the truly important element of this herb is its active ingredient – curcumin. This potent antioxidant is able to slow down oxidative stress and prevent chronic disease, which canker sores can often be. Furthermore, turmeric is a stimulating herb, drawing blood flow to wounded areas and increasing healing speed. You can mix a small amount of turmeric in a glass of water and then use this mixture to gargle with. This can remove inflammation and give you adequate relief during the healing process.