In a double boiler, gently melt the beeswax, carrier oil and shea butter until they are melted and mixed together. This can also be done in a microwave, using a microwaveable jug or bowl.
While that mixture is melting, in a separate glass bowl combine the magnesium hydroxide, zinc oxide and arrowroot powder.
Let the beeswax mixture cool slightly, then add in the essential oils if using.
Gently mix through the powder mixture.
Quickly pour into the deodorant tubes or glass jars before the mixture hardens.