A study reveals that nearly half of TikTok's sinusitis-related videos contain misinformation, mostly propagated by non-medical influencers. This poses risks as viewers may turn to ineffective treatments instead of seeking professional medical advice.
I think these ones are particularly interesting because yeah it’s stupid, but not entirely baseless. Garlic has antibacterial properties, as well as (I think?) antiviral (!), antifungal, and antiprotozoal properties. So it is plausible, and it seems like the reason it doesn’t work is that it’s additionally an irritant, which ends up stimulating mucus production and inflammation, exacerbating the problem.