A Hi! Botox is a fabulous, temporary solution to help relax muscles that are creating "dynamic" wrinkles (lines caused by muscle movement), which may create the appearance you're looking for! It is possible to do filler in the forehead for indention, but that is a very advanced technique, and I would recommend seeing a very experienced aesthetic injector or plastic surgeon, due to the high risk for complications, including skin necrosis or even blindness. I recommend a consultation with your aesthetic provider to discuss your treatment options.