Bonjela gel original is a fast acting pain relief gel used to help fight infections such as mouth ulcers denture sore spots and cold sores it contains antiseptic that helps with irritation and relieves discomfort whist healing the area and preventing further infection bonjela and bonjela cool mint gel should no longer be used by children under the age of 16 bonjela and bonjela cool mint gel continue to be suitable and effective treatments for mouth ulcers in adults and adolescents 16 years