"Come to a head" is an idiomatic expression that refers to reaching a crisis point or a climactic moment. While this phrase is widely used and easily understandable, it's never a bad idea to have a few alternatives in one's vocabulary. Some synonyms for this phrase are "culminate," "reach a climax," "come to fruition," "peak," and "climax." Each of these expressions still conveys the sense of a build-up that comes to a dramatic conclusion, but they offer a bit more variety and nuance. So next time you're describing a situation that has reached its breaking point, consider using one of these alternatives to "come to a head".