14. Taking too many showers
Sometimes we feel dirty (wrongly) when we have our period. This leads us to wash more than we should. However, the water in the shower may be sensitising her vagina to splashing too frequently, and preventing her natural lubrication process. Stick to one shower a day, that should be (largely) enough.
15. Wear synthetic or lacy panties during your period
You need comfort more than ever during this period, so save your teenage cotton panties to pull out on the day.