Hello, Gastric disturbances can definitely affect your breath. Has your husband had routine dental exams and cleanings? if not, schefule a dental visit. If his dental health including his periodontal status and daily home care is good, I would consult a gastroenterologist for an evaluation. Well balanced vitamins with no deficiencies or excess can be a factor. Basic blood testing may disclose an imbalance or raise a concern with organ function. Keep well hydrated. Diet choices can affect this as well. Consider changes made after the surgery. Thank you for your inquiry.