I just read there is a prescription toothpaste. why would an adult need this, if at all?

Rx toothpastes: Three examples of prescription toothpastes are ones with higher levels of fluoride, remineralizing toothpastes such as mi toothpaste, and ones with higher levels of whitening agents. These are for patients with specific needs as adjuncts to their normal oral hygiene regimen.

Prescription : Toothpaste is given by prescription due to the amount of Fluoride it contains. Fluoride helps to combat extreme sensitivity and other decay related conditions. The average person does fine with the dosages delivered in over the counter toothpaste. Toothpaste delivered by prescription should be treated with care as is any other prescription medication...There can be side effects.

Cavity Protection: A popular prescription toothpaste is colgate prevident 5000. Adults with a high incidence of tooth decay may benefit from this product. Studies have shown significant remineralization of root decay from continued use of this product.

Cavity control.: Prescription toothpastes have a higher concentration of Fluoride and so give a greater level of protection from cavities.

High decay rate: Dentists prescribe higher dosage Fluoride toothpaste for people who have high decay rates.