Is there a test of some sort to pinpoint what allergies i have that could be causing my canker sores?

Possibly: Your doctor can entertain blood tests to determine if you have cold sores and/or allergies to something else. Good luck

No: Although allergy to strep mutan ( a normal flora in the mouth) has been suspected to be one of the causes, there is no test to verify it.

Canker Sores: Canker sores can be caused by a myriad of different factors, including viral infection, stress, hormonal fluctuations, food allergies, menses, vitamin deficiencies, and problems with your immune system. So as you can see, it really may be very difficult to prevent them. Speak to your physician for further guidance.

Canker sores: Canker sores are not well understood. Stress, and trauma can be a cause. Some people are sensitive to SLS, sodium lauryl sulfate, in toothpaste. Try switching to a SLS free toothpaste and see if this helps.

Canker sores: You may have what is called an aphthous ulcer or canker sore. This is small sore that appear on the inside of the mouth, the cheeks, the inside of the lips, the tongue and anywhere on the gum. Canker sore is the most common oral lesions. Individual ulcers typically last 1-2 weeks.