The proper bite set of a Pomeranian is a scissors bite.
And a Pomeranian's bite set is usually in place by the age of 10 months old. A scissor bite means that the incisor teeth (the front 6 teeth) in the upper jaw are in contact with but slightly
overlap those in the bottom jaw.
If a Pomeranian has an overbite (the upper jaw protrudes out much further than the upper) or an underbite (the lower jaw protrudes out much further), this is referred to as misalignment or malocclusion.
With minor cases, often nothing will need to be done surgically; however, when teeth are not fitting correctly you will need to be even more diligent with dental care. With very severe misalignment, one or more teeth may need to be extracted, and this is something that your veterinarian will discuss with you.