Mix in other ingredients and stir well. If you are using a semi-hard coconut oil, use a fork, if not, use a spoon. If you are using completely melted coconut oil, you will need to stir several times while the mixture cools to keep the baking soda incorporated.
Pour the mixture into a small glass jar (I make different ones for each family member).
Let cool completely.
To use: dip toothbrush in and scrape small amount onto bristles. You could also use a small spoon to put it on the toothbrush.