This winter my immune system went into overdrive (COVID plus a flu shot), and I got a monster canker sore on my uvula. Here is why that location hurts so much, what makes it hard to treat, and what to watch for.

If you get recurring canker sores, sodium lauryl sulfate (SLS) in toothpaste may be a trigger or irritant. Here is what studies show about SLS-free toothpaste, plus how to switch and what ingredients to look for.

A personal note on living with recurring canker sores, and why this site exists.