Toothbrushes, floss, interdental brushes and similar dental hygiene products all have a ?therapeutic? effect as per an oral irrigator. These are NOT necessarily classified as medical devices under the MDD (certainly, toothbrushes are not), so I believe (as per pkost) that they are also not likely to be seen as medical devices. However, I have seen packaging for irrigators that carry the CE mark (with no number) ? but this could be for compliance to the low voltage equipment directive, or indeed some companies DO see them as (Class I) medical devices.
To confuse matters further, there are many dental items in the MHRAs (UK) Class I medical device database including Dentifrice (i.e. toothpaste) and mouthwash products. There is also a listing in this database (MHRA Class I code Z119) for a ?Dental Instrument (Invasive & Transient Use)?. I suppose an oral irrigator could be classed as such - but so could a toothbrush, which as I pointed out, toothbrushes are NOT medical devices.
Sorry to muddy the waters.
Steve