According to the British Dental Association, there are deciduous molars, all of which eventually fall out by around age 12, and permanent molars, which do not necessarily fall out. All the deciduous molars appear by the time a child is around 2 1/2 years old.
Mascara: Get yourself a pre-wash stain fighter like Shout and apply to the stain using the brush that comes with the pre-wash. Let it sit for about 10-15 minutes, then rinse with hot water. Launder the garment immediately either by hand or in the machine (whichever is most convenient for you).
They wear off better than non water proof mascaras, but all the water proof ones I've tried still needed at least one touch up during the day. Mascara just doesn't look as dark and flawless after a while, no matter what it is (both waterproof and non) and yes, it will smear if you swim and rub your eyes.