Most German Shepherds start teething around 3–4 months old, typically lasting until they are 6 months old. During this time, their baby teeth will slowly fall out and be replaced by adult teeth. At 6 months, all 42 of the German Shepherd's permanent teeth should have erupted, and the teething period will be over.

Much like teething babies, puppies often find that chewing cold or frozen items help to relieve teething pain. While there is a range of teething-specific toys available from most pet stores almost any dog toy can be frozen to help provide relief for your pup.

Your German Shepherd should stop biting and nipping as they mature and with consistent training. Typically, this behavior decreases significantly by 6 months, provided you've implemented effective bite inhibition and training practices from an early age.

The dog's mouth is uniquely adapted for its role as a carnivorous predator. The dog has 42 teeth, with 21 teeth on each side (left and right), and four general types of teeth (incisors, canines, premolars, and molars).