The smoothing hair treatment by PRAVINI is a product that requires specific usage instructions to maximize its benefits. However, based on the current data, there are no reviews available for this product. Therefore, I cannot provide specific recommendations on how often to use it.

Generally, smoothing hair treatments are designed to be used once a week or as needed, depending on your hair type and the level of frizz or damage you are experiencing. It is important to follow the instructions provided by the manufacturer to avoid overuse, which can lead to buildup or damage.

If you have specific concerns or questions about using this product, I recommend checking the product label or contacting the manufacturer directly for detailed usage guidelines.