If Botox relaxes the forehead muscles, does the Nuface device used on the forehead retighten those same muscles?

No, this device is using tiny micro electric currents. The power is not enough to hit any facial nerves to cause long term side effects. Totally safe. Dr Davin Lim. Brisbane. Australia. 

This is a great new at home micro current device- am currently doing a series of patients for testing, will let you know of the results in both a scientific paper and also a YouTube video. Take care, Dr Davin Lim. Brisbane. Australia. 

I really do not know. This depends on your laxity and the product. We are currently undertaking non sponsored trials of this device on several subjects to see if at home products like Nuface and Zerogravity work, or work enough to justify their expense. Results will be published shortly. Dr...