I share the same concerns as your vet!
Tooth fractures of the premolars and molars are very common in dogs due to their propensity to chew on really hard substrates like bone and rawhide and hard toys.
The fracture CAN be monitored at this time if no pulp exposure is evident. I would recommend PULSE ANTIBIOTIC therapy be instituted with Clindamycin antibiotic and your pet's mouth be checked regularly for any signs of gingival swelling or infection approximate to the tooth. Antiinflammatories ( Rimadyl, Previcox, Deramaxx) can be used as needed if you think your pet is experiencing any kind of nerve sensitivity or tooth pain while you are monitoring the tooth.
Extraction is usually the treatment of choice in my practice as it is quick, more affordable, and requires no maintenance! Dogs have 42 teeth, losing one is really no big deal when taking into account their ability to compensate!
In clinics that offer periodontics, that is a great alternative, but will ultimately cost quite a bit more to get done! Add to that the crown can come loose, fracture, or need to be replaced in a short amount of time, and the cost really adds up!!
Monitoring can be done for months to sometimes years at home. Eventually , an extraction may need to be done, so prepare yourself for the inevitable!
I would consider the usage of both Oravet and the new Periodontal Vaccine from Pfizer if you are not already familiar with those products. Your vet can give you the specifics!!
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Best Wishes to You and Your Pet!
Dr. Jodi L. Smith