Saintsman
Someone might have been eating garlic or have been drinking but its better than ignoring it and doing nothing.
So are you recommending reporting a pilot whose breath smells of either garlic or (alcoholic) drink and you don't know which?
Or mentioning it to him/her and asking which?
If you mean report, then I pity any pilot who suffers from halitosis.
I read somewhere that about 25% of adults suffer from it regularly, regardless of what they eat/drink.