How many toothbrushes do you use every year? How many years do you think you will live? How many toothbrushes will you have used in your entire life? Where will most of those toothbrushes end?
It is estimated that the average USA person goes through 300 toothbrushes in their lifetime. 99% of all toothbrushes are made out of #5 plastic (PP or polypropylene). And virtually all of them end up in a landfill or in the environment because, although PP is recyclable, it is rare for toothbrushes to be recycled.
And we all know what the problems are with plastics: being 99% fossil fuels, they have a heavy carbon footprint to begin with; they take a long time to decompose (if they do at all); as they break down, they pollute land and water environments and get eaten by animals, who cannot digest them and get hurt…
So, if there are natural alternatives to plastic toothbrushes, why not give them a try?