I had no idea there was such a thing as mouthwash tablets but decided to give them a try! We have the activated charcoal ones which are only slightly minty (not as much as without the charcoal) but you get the benefit of the activated charcoal. It takes at least 20-30 seconds to dissolve in water. We keep a little glass jar (an old Penzy's spice jar, the mini size) in our bathroom and put a tad bit of water in it with this tab while we brush our teeth and it's ready to go by the end. Afterward it does leave gray in your sink and in the container you dissolved it in, so you'll need to rinse and wipe if you want to keep things looking clean.