Best to have oral sores checked by your dentist for professional care and treatment options.
Dr. Joe Ferraro
Jennifer Rankin, DDS
Justin W. Ruffner, DDS
Yes it is ok. If you accidentally swallowed it. Read the instructions on pack for more information.
But if you get these ulcers very frequently, I would recommend to see a dentist to see what are those ulcers and what causing them. There could be various reasons for mouth ulcers.
Hope this helps.