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).
The baking soda is gentle enough to slough off the stains without damaging your tooth enamel, and the hydrogen peroxide is a whitening agent that's found in many commercial tooth-bleaching kits. Make sure to check with your dentist before using this treatment, as it may damage veneers and crowns.