For the ladies that take their pills at the suggested time (usually within 2 hours of the same time each day) you should be fine. The one thing to keep in mind is that the pill in general is 97% effective, there is still room for error. One of the biggest thing is OTC medication like for colds. So ALWAYS read your package insert, and when in doubt call you Dr office to see if a back-up method is needed.
As for the dental dams, they are basicly a sheet of latex (just like the surgical gloves) It's the one item that kids loved to play with when I would do contreceptive presentations, because most of them have never seen one let alone used one.
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