33.15.3 Substantivation of infinitive with vor (vor + infinitive)
With vor + infinitive an action before another action is described. The logic is the same as with nach. The English translation is best preposition with gerund.
Examples
Vor dem Schlafen gehen,
Zähne putzen nicht vergessen.
= Don't forget to brush the teeth before going to bed
Vor dem
Waschen sollten sie die Temperatur kontrollieren.
