Frizzy curls and coils can be caused by a variety of factors, including dryness, damage, and lack of moisture. Here are some modern treatments that can help to tame frizzy curls and coils:

Moisturizing: Moisturizing is key to keeping curls and coils looking their best. Use a leave-in conditioner or a curl-defining cream to add moisture to your curls and keep them looking smooth and defined.

Deep conditioning: Regular deep conditioning treatments can help to repair damage and add moisture to dry frizzy curls. Look for a deep conditioner that contains ingredients like coconut oil, shea butter, or avocado oil to nourish and hydrate your curls.

Protein treatments: If your curls are damaged, protein treatment can help to strengthen them and reduce frizz. Look for a treatment that contains hydrolyzed proteins, such as keratin or collagen, to help repair and strengthen your curls.

Low manipulation styling: Avoid styles that require frequent combing, brushing, or heat styling, as these can cause damage and frizz. Instead, opt for low-manipulation styles, such as braids, twists, or buns, to keep your curls looking smooth and defined.

Trim your hair: Regular trims can help to remove damaged or split ends which can make curls appear frizzy.

Styling with the right products: Look for styling products that are specifically formulated for curls and coils, such as gels, creams, or mousses, and avoid products that contain alcohol or sulfates, as they can dry out curls and cause frizz.

It's also important to maintain a healthy and balanced diet, as well as drink enough water, to ensure that your hair and scalp have all the nutrients they need to stay healthy and frizz-free. Remember, every head of hair is different, so it may take some trial and error to find the right treatment for your frizzy curls and coils.