Curl defining creams are designed to enhance your natural curl pattern, reduce frizz, and add moisture to curly hair. How often you should use them depends on your hair type, its porosity, and your styling needs. Here's a general guide:

1. Daily or As Needed: Most people with curly hair can use curl defining cream daily, especially if they wash and style their hair every day or every other day. Apply it to damp hair after washing and conditioning to help define curls and lock in moisture.
2. As Part of Your Styling Routine: If you have a wash-and-go routine or style your curls regularly, apply curl defining cream as part of your usual styling process. It's particularly beneficial right after a wash when your hair is most receptive to absorbing products.
3. Adjust for Hair Type and Climate: People with finer hair may find daily use too heavy and opt for every other day or as needed to avoid weighing down their curls. In humid climates, you might need it more frequently to combat frizz. Conversely, in drier climates, you might use it less often to prevent product buildup.
4. Listen to Your Hair: Pay attention to how your hair responds. If your curls feel dry or lack definition, you might need to use the cream more frequently. If your hair starts to look greasy or limp quickly, scale back on the frequency or try using less product.
5. Refresh Between Washes: For days when you're not washing your hair, you can still use a small amount of curl defining cream on dampened curls or a curl refresher spray to reactivate your existing product and redefine your curls.

Remember to always read the product instructions and consider doing a patch test if you're trying a new product. It's also essential to maintain a balanced hair care regimen that includes regular deep conditioning to keep your curls healthy and moisturized alongside your use of curl defining cream.