Recurring brown stains
The last couple of days I have noticed with horror brown staining of my bottom teeth. It's mostly close to the gum lines. I can brush and scratch the stains away. The stains happen after I eat, though not every single time. If I gargle and swish water vigorously, some of the staining goes away too. So in other words, it's very superficial and soft.
I never drink coffee. I used to drink tea daily but haven't done so in months. The only time I have soda is when I make root beer floats. But I haven't had one in a couple of weeks. I do not smoke.
I have the last couple of months used xylitol as part of my dental care. Either with mints or just rinsing with pure xylitol. I have used xylitol once before for a long period and did not have this problem.
I'm really worried that my already fragile teeth are falling apart! What is going on? I would go to my dentist but I'm currently unemployed and no longer have dental insurance. I am about 3 months past my bi-annual cleaning. And finally, I am prone to plaque.