Mouthwash

Mix water with baking soda and a drop of peppermint essential oil for an effective zero-waste mouthwash. Costs pennies per use.

Chewable mouthwash tablets come in glass jars or compostable packaging. Just chew, sip water, and swish. Brands like Bite and Georganics offer plastic-free options. About $10 for 60 tablets.