We have no idea what crackpot dentist started this one, but monthly cycles have nothing to do with dental work.
Swimming with a tampon is totally safe and in no way puts you at greater risk for drowning.
Ovulation cycles aren't always regular. If you are on a particularly short ovulation cycle and a particularly long period, sperm can fertilize an egg even during menstruation. Use a condom every time!
During your period, you can do any kind of activity you normally do when you're not on your period. So, avoid strenuous activity only if that's what you do during the rest of the month.
Virgins certainly can use tampons, and tampons won't take away their virginity. That's something only sex can do.
There is absolutely no way for others to tell, unless you bleed through your white shorts like I did at summer camp because I was so into flirting with Bobby Lackey that I forgot about changing my tampon. So, as long as you stay away from Bobby Lackey, you should be fine.
Period cramps come from your uterus. Frosty feet or an ice cream headache aren't going to affect that.
You probably won't have a regular period while breastfeeding. It will return at some point though, and it won't send you a formal notice of its arrival -- meaning that you ovulate without knowing it at first. And when ovulation's possible, pregnancy is, too.
While slight shifts are normal during the hormonal changes of menopause, very heavy bleeding can indicate some serious health problems. Don't write this off as part of the change.
Here's what it all boils down to: Nutty "facts" about your period likely aren't true, and if you're having sex and don't want to get pregnant, use protection. When in doubt about health issues, ask your doctor... and stick to common sense for the rest. For instance, just because you're not more likely to be attacked by sharks during your period, still avoid them, OK?
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