a shit in the teeth - When your teeth look like a raccoon bit them, even after you

When your teeth look like a raccoon bit them, even after you brush them like a madman.

My teeth look like they were stained by a coffee monster. That’s a shit in the teeth.

I brushed my teeth 10 times, but it was still a shit in the teeth.

Coffee and smoke turned my teeth brown. That was a full-blown shit in the teeth.