I would like to know about the frequency and effects of forehead and wrinkle botox.

I'm considering Botox treatment for fine lines on my forehead and around my eyes (at the corners of my eyes). I've heard that Botox is effective in reducing wrinkles, but I want to do more research before deciding.

I am most curious about when the effects of wrinkle botox treatment will appear, how long it will last, and the appropriate frequency for repeat treatments.

How long does the effects of Botox for wrinkles on the forehead and around the eyes generally last?
I would like to know how often it is ideal to have a repeat treatment.
There is also talk that if you get it too often, you can develop a tolerance, so I would like to ask about the frequency of wrinkle botox treatments.

Also, please let me know if there are any side effects or precautions after wrinkle botox treatment, and if there are any things to consider to achieve natural and satisfactory results.
Someone said that if you get botox on your forehead, your eyelids may feel heavy or your eyebrows may change position. Is there anything to worry about??