I once made the mistake of roasting a head of elephant garlic and eating almost the whole thing myself, with nice crusty French bread and some runny brie. Or maybe it was Camembert. I was having one of those sybaritic, indulge-yourself kind of evenings.
Oh yes, roasted garlic is yummy. But eating a whole head of it by yourself is not advised. Not only will you suffer a certain amount of gastric upset, but everyone, even your dogs, will recoil in horror from the noxious cloud of garlic that emanates from your every pore for days after.
Do you really want to spend $30 on a countertop garlic roaster to find out what that's like? Trust me, you don't.