Overcoming Comparison Struggles

What would Dave Ramsey answer to the question regarding combining finances in a marriage: What does it mean precisely to combine finances when entering a marriage? Let's imagine a situation where a future-to-be-wife has double the income of a future-to-be-husband, and they are about to combine their incomes and experiences. How should they prioritize spending if he has many more uncovered needs than her, such as needing expensive dental work that seems more urgent? She has needs that are important to her as well, but she can't address them because he has many more urgent ones. Should she sacrifice her needs until all his needs are covered and they are on the same level of comfortable living, or how should they allocate their money?