Best Answer: People have always argued what the best oil out there is. And most people either go for royal purple, castrol, and mobil 1. I personally choose Mobil 1, but the choice is really opinion based.
The sores may occur singly or in groups and vary from about 1/8 inch to 1 -1/4 inch in diameter. The sore may be painful for three or four days, but complete healing usually takes ten to fifteen days. Canker sores may recur many times each year. Causes: No one knows what causes canker sores. They may be caused by a virus, may be a form of allergic reaction or may result from an auto-immune condition (meaning that the body has developed an immune reaction against its own tissue).
By Mayo Clinic Staff. The precise cause of canker sores remains unclear, though researchers suspect that a combination of factors contributes to outbreaks, even in the same person.Possible triggers for canker sores include: 1  A minor injury to your mouth from dental work, overzealous brushing, sports mishaps or an accidental cheek bite. Inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis. 2  Behcet's disease, a rare disorder that causes inflammation throughout the body, including the mouth. 3  A faulty immune system that attacks healthy cells in your mouth instead of pathogens, such as viruses and bacteria.