Not brushing your teeth not flossing eating a LOT of junk food
Irish people don't particularly have bad teeth.
People who smoke to not have bad teeth, their teeth get stained if they smoke too much, and do not have them cleaned by their dentist every 6 months
Bad Teeth , for sure
This is a stereotype. Do not believe it.
YES lots of people eat it, but it is bad for your teeth.
Teeth go bad of sugar
All sugar is bad for your teeth.
THE BEST THING TO DO TO PREVENT BAD TEETH IS BRUSH YOUR TEETH.
no burping isn't bad for teeth it may be an acid/gas but it isn't a bad type which would damage your teeth
Yes, people did smell more strongly than is acceptable in modern times, and more had bad teeth than do now. But that was the way life was, and people put up with it because they knew of no other way of live.
for teeth if you have a bad cavity or if you are missing some of your tooth
yes you have to have braces on if your teeth are bad or less your teeth will move alone and your mouth will be weird