The present invention concerns a disinfectant or antimicrobial composition for use in dental treatment, such as treatment andor prevention of periodontitis, gingivitis or other forms of oral infection. Terminal fittings are fixed to ends of wires and are held by the housing. This feature is an indexing system. The switching device includes a gas generator for releasing a gas flow into a pressure chamber and an expandable hollow pot which can be driven by the gas flow.