I recommend Gargrin Zero.

I have been using this mouthwash exclusively for several years, and it has established itself as an essential item that I always keep stocked before running out. I have tried products from various companies, but I find Gargrin to be mild and reliable. While the Original isn't particularly irritating, the Zero version is significantly milder because it is alcohol-free and contains less harsh ingredients. It offers the same efficacy as the Original, but it is perfect for those who can't stand spicy or stinging sensations and tend to spit them out immediately, as it allows for a longer gargle. If I use Gargrin before going to sleep, I wake up in the morning without bad breath, leaving my mouth feeling fresh. I used to have swollen gums frequently, but those symptoms have largely disappeared lately. I think it works because it cares for the areas the toothbrush can't reach after brushing. My plaque has also noticeably decreased. It offers great value for money, so I highly recommend stocking up during buy-one-get-one-free promotions; it is suitable for both adults and children.