How Salt Works in Sweet Dishes
Salt doesn't make food taste salty when used in small amounts in desserts. Instead, it acts like a flavor booster that makes other flavors stronger and clearer. When salt is added to sweet foods, it suppresses bitter tastes that might be hiding in the dish, making the sweetness stand out more. This is why a tiny pinch of salt in chocolate cake or brownies makes them taste richer and more chocolatey.
The Science Behind Salt Enhancement
Sodium ions in salt interact with your taste buds in a special way. They can block bitter taste receptors and activate sweet taste receptors more strongly. This means the sweetness in your food actually feels more intense when a small amount of salt is present. It's similar to how salt enhances savory flavors, but in reverse. Scientists have proven this effect works across many different types of sweet foods.
Common Uses in Recipes
Professional bakers and chefs add salt to almost all sweet recipes, including cakes, cookies, brownies, chocolate desserts, caramel, and even ice cream. The amount is typically very small, like a pinch or 1/4 teaspoon in a batch that serves multiple people. Some recipes for salted caramel or sea salt chocolate deliberately make the salt more noticeable as a flavor feature, but most dessert recipes use it invisibly to improve taste.
Why You Don't Notice the Salt Taste
Your taste buds have a sensitivity threshold, meaning they only detect flavors above a certain level. The amount of salt used in sweet recipes is kept below this threshold, so your brain registers the enhanced sweetness without detecting a salty taste. This is why a recipe calling for salt in a chocolate chip cookie doesn't make your cookies taste salty, even though the salt is definitely there doing its job. 
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