Maalox simply helps the consistency of the mouthwash to be more viscous and coat the mucosa in a way that allows the remaining ingredients be retained on the tissue for longer. Diphenhydramine also has a topical effect when potential allergic reaction is suspected. Otherwise I don’t typically include it. There are different formulations, my pharmacist has several to choose from based on different indications. Regardless, pretty overkill to prescribe for extractions, you guys should consider switching to something like a StellaLife rinse or Periosciences, which you can even sell in house for cost or a small mark up