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).
Considering the stain that would make sense, but that would also be a problem since the dye in a wood stain is pretty concentrated and not likely to come out. But if a little bit of the finish on an older chair rubbed off, then you could try pre-treating the stain on the white cotton shirt with CloroxÂ® Bleach Pen Gel.