Brushing your hair dry for waves, especially when using a deep wave frontal, is not recommended. Dry brushing can lead to frizz, breakage, and a loss of the defined wave pattern. To maintain the beautiful texture of deep wave frontal hair, it's best to brush or comb it when it's damp or slightly wet.
Using a comb with wide tines or a detangling brush, gently detangle your damp hair to begin. To reduce friction and improve the process, use a detangling spray or leave-in conditioner. To prevent pulling and breaking, start combing at the ends and work your way up to the roots.

For the best outcome, use a low heat filter to keep your hair's wave pattern unharmed. Regularly moisturizing and hydrating your deep wave frontal hair with suitable products will keep it looking luscious and defined. Brushing dry hair can disrupt the wave pattern, so always opt for gentle handling when it's damp to maintain those gorgeous waves.