Not a grill owner myself, but please be cautious and/or avoid using wire grill brushes. There are so many published cases of wire bristle ingestion/retention, and sometimes it takes people a while to even realize that's what happened to them. Abdominal pain can mean so many things, and the bristles are so small.
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Free access, pictures:
Grill Brush Bristle Case Series: Three Unique Presentations of Ingested Foreign Bodies (
archive). The last one is the scariest: they couldn't find it in an EGD, saw its effects but not the bristle on a CT... and then, months later, the patient somehow told the screening tech that he didn't have any metal foreign bodies in him and
had an MRI for unrelated issues. After which the pain, shockingly, recurred.
Well, if Tammy ever reads the thread, there's a fun project for her. There's video evidence of how Jack eats, so it wouldn't even be suspicious if he ended up a case study of a 50-something year old man with several dozen retained grill brush wires. Jack would appreciate it, too: finally, his name is carved into history.
In Jack's case, wouldn't it be marbling?