They are 100% safe. Just like all other household items that work on electricity such as blenders, microwaves, irons, etc, a foot massaging machine works in the same pattern. We suggest you take precautions before using an electronic gadget. You must go through the manual that the best foot massager in India comes with to have proper instruction on how you can work with this machine. Using the machine if causes any inflammation or issues, then you should immediately stop using it and consult a doctor.