308 and 408 are lower premolars. Lower cheek teeth do not have infundibulae.
There are congenital defects where the horse does not produce the dentin required to back fill the pulp chamber as the tooth erupts. Thus leaving exposed pulp chambers. This can be problematic.
However, the pulp chamber in a tooth and the infundibulum in a tooth are 2 totally separate structures.
I have a sneaking suspicion that you may want to contact a either a veterinarian who specializes in dentistry or a dental practitioner. I've spent 300 hours at the Academy of Equine Dentistry in Idaho...I don't know a lot, but I know that whatever your vet wrote (as has been transcribed here including the difficulty in reading the writing) does not add up. And you shouldn't lose a sale based on misleading/incorrect information from someone (even a veterinarian) who does not have training in dentistry.
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