Bentoform Dental Gel is for external use only. Take it in the dose and duration as advised by your doctor. Wash your hands before and after applying the medicine. Make sure not to swallow the medication. Do not stop using it until you have finished the complete course, even when you feel better.  You must avoid eating, drinking, or smoking for at least 30 minutes after using it. Do not use it for more than a period of 4 weeks. 
The medicine is generally safe to use with no common side effects. Occasionally it may cause severe allergic reactions which include rash, swelling of face or tongue, and breathing problems. Get emergency help if it happens.  It is also advisable not to wash the treated area immediately after applying the medicine.
It is not likely that other medicines you take by mouth or injection will affect the way this medicine works. This medicine should only be used if it is clearly needed if you are pregnant or breastfeeding. Ask your doctor if it is safe.