Because every treatment carries its lot number, a supplier recall becomes a question the clinic can answer: which patients had this lot. You find exactly who needs a call, instead of reviewing every patient treated in that period.
It also answers the everyday questions: what did this patient have last time, how much, and where.
The same batch number does a second job. Where the product and batch match something your clinic holds, stock control takes it out of stock by itself, so the write-up your practitioner already fills in keeps your levels right as well as your records.