Before using chlorhexidine, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. External use only. Avoid direct contact with the eyes or mucous membranes. Rinse your mouth with the solution after brushing your teeth, usually twice daily (after breakfast and at bedtime) or as directed by your doctor. Avoid applying over large surfaces. Ask your pharmacist or healthcare provider before using any medicine.