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Bad breath can have many causes. It is seen that it may originate from the stomach as well as from the teeth. Bad breath can occur in cases where oral hygiene is not observed. When the residues between the teeth are not cleaned thoroughly, it causes bacteria formation and creates a bad odor in the mouth.
After the zirconia teeth are made, bad odor may occur if oral hygiene is not taken care of. However, the zirconium crown usually does not cause bad odor from the coatings. As long as oral hygiene is taken care of, zirconia teeth do not cause odor due to the nature of the material used in the construction of the veneer.