What are the characteristics of forehead fillers, how do I select a product, and how do I check for safety before the procedure?

I would like to request general guidance on what information should be checked first when consulting about forehead fillers. Rather than deciding on a specific product or dosage in advance, I would like to know how to determine suitability and conditions to avoid during the examination.

When receiving an explanation of forehead filler characteristics, are there any specific questions I should ask besides the ingredients, formulation, and approved scope of use? If I have a record of past procedures on the same area, I am also curious about which documentation I should prepare: the product name or the date of the procedure.

Also, is the forehead filler plan determined by considering the shape of the frontal and profile views, as well as facial expressions? I would like to confirm whether the consultation and the actual procedure can be decided separately, and what the criteria are for postponing the procedure on the same day.

Finally, I would like to know when to check the progress after forehead filler and how I will be informed about any abnormal signs that require immediate contact with the clinic. It would be helpful for me to prepare for the consultation if you could explain the general precautions and the details that vary by individual.