The cap of Gum Proxabrush Travel is used as a handle to bandter reach the posterior zones. Small and practical, this ambulatory brush is ready to use. Ideal in travel.Antibacterial protection: The brushes are protected by an antibacterial active ingredient, Chlorhexidin, which inhibates the bacterial growth on the brushes, up to 2 weeks.With ventilation, the cap protects the brush whilst allowing it to dry.