Getting the teeth cleaned then immediately destroying the hygienist's hard work by eating breakfast.

Otherwise known as "Monday".

@djwfyi Every time "your teeth are in good shape except for the tea stains. We'll see what we can do" (and they always get them buffed out).
There is literally a coffee shop between the dentist and my house and I walk there because it's all of a half mile.
I "have" to support a local business, right? I mean, after supporting the local dentist.
@djwfyi you could have done worst by drinking coffee and getting them all dark