I get recurring sore throats, frequent and lingering minor colds and large but not painful canker sores (no fevers). what can i do? thanks!

Rest and Sleep well: Studies have shown that the 2 most common reasons for adults to get recurrent upper respiratory tract illnesses are: 1- improper sleep. 2- touching our face a lot! stress can also be a definite culprit. There are other pathologies that could be the reason for your recurrent illnesses so a trip to your primary care provider is also warranted at this stage.

Immune system: You should have a complete medical exam with your medical doctor. The blood work may reveal if your immune system is weak or if you have some other ailment. If all is ok maybe rule out any oral causes such as allergy, mouth breathing, burning from oral rinse/ toothpastes, foods etc.