The advert cleverly and even ironically illustrates how brands are now so much more than a name identifying the origin of a product or service. In this example DOVE represents a cause that is communicated in a very clever way. For those that identify with the cause (just about everyone who feels inadequate paging through a magazine, I would imagine) will now (hopes DOVE) identify just as powerfully with the DOVE brand. The fact that DOVE is a beauty brand makes the communication very powerful and perhaps ironic too; historically DOVE itself must have been guilty of a touch up or two, or at least its owners have.
From a trade mark law perspective, it highlights the so-called dilution provisions of trade mark laws. These are the provisions that enable a trade mark symbolising a brand to be protected against unfair advantage and detriment, absent confusion. For example, a canny marketer could use the DOVE trade mark in relation to unrelated goods, say cars (avoiding confusion), but still take advantage of the cause ("real beauty") now represented by trade mark, and hence the advertising goodwill in the mark. Similarly, if the mark DOVE was bid on as a keyword for a breast cancer product, then potentially such use could affect the economic value of the brand, DOVE.