Says Rita Hazan:
The best conditioning treatment depends on what damage your hair has. Protein treatments are good but too much protein can also have the reverse effect and make the hair dryer and break as a result. I recommend only doing the protein treatment every 4-6 weeks and the heavy treatments (masks, oils) once to twice a week. At Rita Hazan Salon, we use the Nigelle Japanese Conditioning treatment and after 2-3 treatments, the hair should be restored to how healthy it was before the damage. However, it is necessary to continue to maintain the treatments or your hair will continue to suffer from the damage of day-to-day styling.