It definitely stops after about eight hours of eating, sometimes longer, because I didn't have it at all for weeks while on the gluten-free diet. Mind you, I didn't have pizza the whole few weeks either so IDK.
BellVie, you said that you used to get a similar taste in your mouth after eating baked goods, I'm guessing this was before you were diagnosed? So, then did you celiac cause this or was it a food alergy? Just a little confused.