Hopefully the link Pdf works, it shows you the different stages on account of the change in teeth. Not clearly visible in the picture is that the mature teeth (4 white ones in the middle after 18 months) have a groove. This is totally diffrent from the "milky"teeth (grey coloured in the picture), they are smooth and do not have a groove.
snijtand = fronttooth (or "cutting tooth")
breed = wide
maand = month
wissel = change
verschijnt = appears
Update with a picture from Pirsch magazine courtesy of Martin, thx for sending the picture.