I'm afraid Hard Disk Sentinel (or any other software) can't help in restoring 0% hard disk health to 100%. When hard disk drives report 0% health, it means that the error-level threshold is already reached, the drive is considered to be failing.
Restoring the health to 100% would not change the failing component at all, so regardless of that value, the drive will fail (or "just" data loss will likely happen).

Hard Disk Sentinel has function to correct the error counters by using the "Offset" function. But the software in general and this offset function designed for the current user: to (after diagnosing the hard disk, after revealing and stabilizing, repairing problems) acknowledge the reported status, correct the error counter(s) of the hard disk drive to prevent displaying issues related to the past and be notified about possible new problems only. This is possible only when the health is 1% or higher, but not possible when the error-level threshold (0% health) already reached for the hard disk drive / SSD.

Of course it is not possible (by any software) to completely, permanently clear / reset the error counters and show failing hard disks as perfect or to show older hard disks as brand new. The configured corrected values recorded in the current installation of the software, so when the hard disk drive moved to new system (where the offsets not configured) then the original status is displayed.

Hard disks / SSDs generally record problems occured in their lifetime. Many of such problems (for example communication problems, spin up problems, weak/pending sectors etc.) may be related to the operating environment: cables, connections, power supply and so. These can be cleared - to confirm that the status is fixed and we want to focus on possible new problems only.

For example the https://www.hdsentinel.com/hard_disk_case_communication_error.php page gives details and example about how to clear the error counter and acknowledge the problem (to remove from the text description) after changing the cable. This way after this adjustment, Hard Disk Sentinel will display only possible new problems.

Hard Disk Sentinel Pro offers numerous ways to diagnose hard disk drives, report problems, reveal issues and fix them in all possible ways, for example by using Disk menu -> Surface test -> Reinitailise disk surface function (which performs "regeneration" of the drive). This function can help in numerous situations to improve the disk drive usability (and in many cases the health value too) so it may worth a try. But even that function can't help to make 100% health for a hard disk drive previously reported as low as 0%.

Any time the Report menu -> Send test report to developer option is useful: then it is possible to check the actual status of the hard disk drive and advise about the current situation, the best ways to perform diagnostics / repair and check how things can be generally improved.