I usually don't use the stoppers: I just hold my fingertip over the bottle opening and tip the bottle a bit until I feel the liquid, then dab from my fingertip: I feel like I have better control that way. I know I've read from other people who are worried about transferring body oils or flakes of skin (ewww :P ) back to the fragrance, but that always leaves me wondering, "How oily or flakey can one person's skin be?" ??? : I might worry a bit more if I had a larger amount of parfum (say 1 oz or more) in a bottle: in that case, I'd probably use a pipette to decant a bit into a little personal atomizer.