It is generally safe to get a keratin treatment, but it is possible to overdo it. Keratin treatments work by adding a protein called keratin to the hair, which helps to repair and strengthen the hair shaft. However, following the recommended treatment instructions is important, avoiding overusing them. If you use a keratin treatment too frequently or leave it on for too long, it can cause the hair to become overly stiff or brittle. Additionally, some keratin treatments contain chemicals that can be harsh on the hair if used excessively. It’s important to use these treatments as directed and to consult with a hair stylist or other trained professional to determine the best frequency and application for your individual needs.