For those of you who are restoring, you should generally follow these rules to stay safe:

1. If any part of your skin feels cold or changes color while wearing the device, take the device off.

2. It is important to give your skin a break periodically. So take of your device at certain intervals. Personally, I give myself several hours during the day without a device, you can retain during this period.

3. You may want to talk to your doctor/urologist before restoring...especially if you have any serious health conditions in that area. 

4. If anything hurts, take off your device. 

Foreskin restoration is meant to beneficial, not painful. Stay within your set, reasonable boundaries and you should be fine.