> It doesn't worsen your health, it either does nothing or improve it, so it is reasonable to do it
There are thousands of wives tales and pseudoscience remedies I don't need to waste my time on. If not backed by actual science, this type of recommendation is no better than any of them.
Here's the latest info I found on PubMed: https://www.ncbi.nlm.nih.gov/pubmed/30968949 - "Home use of interdental cleaning devices, in addition to toothbrushing, for preventing and controlling periodontal diseases and dental caries." As dental plaque is the primary cause [of tooth decay and gum disease], self-administered daily mechanical disruption and removal of plaque is important for oral health. Toothbrushing can remove supragingival plaque on the facial and lingual/palatal surfaces, but special devices (such as floss, brushes, sticks, and irrigators) are often recommended to reach into the interdental area... Using floss or interdental brushes in addition to toothbrushing may reduce gingivitis or plaque, or both, more than toothbrushing alone. Interdental brushes may be more effective than floss. Available evidence for tooth cleaning sticks and oral irrigators is limited and inconsistent. Outcomes were mostly measured in the short term and participants in most studies had a low level of baseline gingival inflammation. Overall, the evidence was low to very low-certainty, and the effect sizes observed may not be clinically important. Future trials should report participant periodontal status according to the new periodontal diseases classification, and last long enough to measure interproximal caries and periodontitis.
Basically, good current dental hygiene practice is to brush and floss like the experts tell you.
There are thousands of wives tales and pseudoscience remedies I don't need to waste my time on. If not backed by actual science, this type of recommendation is no better than any of them.