What’s the reason for having to remove aligners/brush teeth when eating and drinking? I understand removing them to eat, but what’s the reason for brushing before putting them back in? Also with drinking, is the reason to remove them before drinking purely for staining? 

If it’s just staining/cavity reasons, then surely going out for a meal, putting them back in after eating, and then just waiting until I’m home to brush my teeth will be okay? 

And sipping on a drink while I study without removing them will be okay too? I was worried it would somehow affect the results but if it’s just staining then I don’t really care.