The purpose of this study is to determine the effect of chewing gum, during the first one hour of examination in patients undergoing CE for GTT and SBTT time and the proportion of cases with complete small bowel examination and gastroscopy intervention.

The participants will include patients who need to a capsule endoscopy (CE) in this unit. The investigators will include 200 participants who had a CE at our centre based on the gastric transit times. These will be randomly divided into two groups. The participants (chew chewing gum) and the controls (do not chew chewing gum).

Inclusion Criteria:

• Patients aged ≥18 years and <80 years old presenting for capsule endoscopy. Obtained of written informed consent before the procedure.

Exclusion Criteria:

• Patients on motility enhancing and/or slowing drugs(narcotics/prokinetics) should stop these at least 7 days prior to the procedure.
• Patients, who have proven or suspected obstruction of the bowel.
• Patients, who have had prior small bowel and/or gastric surgery.
• Patients, who have a dysphagia prohibiting.
• Patients with diabetes mellitus and/or hypo-/hyper-thyroidism.

Individual participant data sharing will be consider after study

The patients were instructed not to tell the endoscopist or the investigators about whether or not they used chewing gum before, during, or after the SBCE procedure.