I would like to know a quick solution to get rid of canker sores and stomatitis in my mouth.

Lately, even the slightest fatigue causes mouth sores and canker sores to break out, making it very difficult to eat. I am worried because this keeps happening, and I wonder if my immune system is weakened or if I am deficient in vitamins. Is there any way to help these wounds heal faster? Please share any tips on managing immunity and habits for maintaining oral health.