I have teeth in a terrible state due to not brushing much when I was a kid(it came and went sometimes I brushed for months then stopped for months)
It was just lack of a pattern, as I went to sleep different times each night, wheras when I was at home till 16 I got into the routine as I had a set bed time of brushing at 10.30, then 10 minutes of tv at 10.40 then bed.
Also had bulimia(im a guy) and that of course rotted my teeth
im now 25 and they are a bad colour, but last year I lived in cramped tiny flat full of insects, damp, windows covered in sheets and unable to be opened. Junkie neighbours with all night sex parties landlord came in one day and tried to grab me and illegally evict me(saying I hadnt paid rent but was getting housing benefit paid to him at the time)
Anyway that made me depressed so I didnt brush my teeth and in the months up to september I started to get sore teeth.
I notice the big teeth at the back(are they molars?) started to sort of file down, and I always had bad breath, then one got chipped one day, then in November as I was eating bread half of it came away(though it didnt bleed) then on New Years Eve it was ruined by agony and for the next 10 days I had to take loads of ibroprofen and drink hot salty water to calm nerves, also rubbing toothpaste into gum and tooth calmed it down, until the toothpaste disintegrated naturally, I went through a whole tub of toothpaste in about 2 or 3 days.
Anyway my teeth now are horrible, orangy, not as bad as a smoker or alki but definately not white
Still dont brush evey day as I have been exhausted recently and keep forgetting then rushing to bed, but my breath is disgusting.