If this is your first numbing spray: one pump, then wait. Give it the full time on the label before deciding nothing happened. Doubling up after ten seconds is how people end up numb well past where they wanted to be.
If you are the one being gone down on: remember that it transfers. A numbed throat numbs whatever it touches. Let it absorb fully, and skip it if sensation is the point of the evening.
If you want flavor and not numbness: buy the tingle spray. No anesthetic, no numb throat, just a flavored buzz on the tongue. A flavored lubricant does the same job in a bottle that outlasts a spray several times over.
If you are using toys in the same session: check the label before you mix. Water based formulas are safe with every toy material we sell. Silicone lube is not, and it has no business near a mouth anyway.
If benzocaine or any topical anesthetic bothers you: skip the numbing sprays. Numbing also masks discomfort, and discomfort during oral is a signal worth keeping. Use a flavored lube instead.
If you are buying it as a gift: the flavor matters more than the formula. Strawberry, cherry, watermelon and mint are the four that move. Mint reads as breath freshener, which some people prefer and others find distracting.