Yes, you can leave sweet almond oil in your hair. Sweet almond oil is a popular natural oil that is commonly used for hair care. It is known for its moisturizing properties and is rich in vitamins, minerals, and fatty acids that can nourish and condition the hair. Applying sweet almond oil to your hair can help to hydrate dry strands, reduce frizz, and add shine. It can also help to strengthen the hair and promote hair growth. To use sweet almond oil, you can apply a small amount to your hair, focusing on the ends and avoiding the roots if you have oily hair. Leave it in for a few hours or overnight.