Other means of cauterization include the prescription product Debacterol, which will completely eliminate the pain and promote full healing within 3-5 days. What Causes This is where a podiatrist comes in. These small, round or oval, painful yellowish sores often 窶ｦ There are many different types of dental needs and a lot of different services that can be offered. For simple, run-of-the mill mouth ulcers, you can try one of the many home remedies available including baking soda and water mouth rinse or paste, a salt water rinse, alum, milk of magnesia, peroxide, Aloe Gel, Bee Propolis Extract, and many others. If you have a canker sore that lasts longer than two weeks, bleeds, or gets bigger over time, it窶冱 a good idea to visit your doctor.