Toothpaste is a commodity that produces a lot of waste. Firstly, you can never finish the toothpaste. There is always some left. Secondly, you have to discard the plastic casing contributing to the plastic pollution. There has to be a way where toothpaste can be re-imagined which produces zero waste.
Using current form of toothpaste and its packaging produces waste.
Design a new kind of mouth cleanser that produces Zero waste (or biodegradable waste) which can be made commercially available.