As the Aesthetic Director at Wellaholic with over a decade of experience, I'll share the key disadvantages of hair botox. First, it's expensive due to the complex formulas used. Second, you need to invest in sulfate-free aftercare products to maintain results. Third, it may not fully straighten curly hair textures. Fourth, the flat ironing step risks heat damage. Finally, those with sensitive skin could experience irritation from the ingredients.