There is maybe a small window of opportunity to help the cells recover from oxidative stress and ultimately death by using steroids and a hyperbaric chamber, or maybe powerful antioxidants, but even this is disputed in the literature. Once the hair cells or synapses die from loud noise exposure, it's permanent. Damage can also occur to the auditory nerve itself. There is currently no known way of bringing back one's hearing, although, there are trials currently ongoing to try and achieve this, as we all know. People have been scammed on this site with the promise that their hearing could be restored at the cost of $18,000, and of course, it didn't work.
Tinnitus is primarily a brain problem, and the posts you quoted of mine were specifically aimed at people who were over-protecting and had become phonophobic (which is a problem on this forum that isn't addressed with serious consideration). This is not to be mixed up with protecting one's hearing whilst in dangerously loud environments. I've been in contact with people who were stuck protecting their ears every minute of the day and had become extremely phonophobic to the point that they were paralysed with fear. In the end, they needed professional help to get their lives back in order. It's not going to help your tinnitus if you protect your ears 24/7, but it could make it worse. There will be, however, cases where people will experience natural fading, but this has nothing to do with healing. These are neuroplastic changes that are not fully understood, and one could equally associate these improvements to wearing shoes every day.
There was a study done in Manchester that showed the overuse of earplugs can actually induce tinnitus and lower the auditory threshold by 6 dB over a matter of days. I found it interesting how some of the study participants described the way in which the tinnitus sounds emerged. There was quite a variation from train whistle sounds to pure tones, and hissing, clicking, creaking, etc. Here's an excerpt from the study and a link to it:
Abstract
The occurrence of tinnitus is associated with hearing loss and neuroplastic changes in the brain, but disentangling correlation and causation have remained difficult in both human and animal studies. Here we use earplugs to cause a period of monaural deprivation to induce a temporary, fully reversible tinnitus sensation, to test whether differences in subcortical changes in neural response gain, as reflected through changes in acoustic reflex thresholds (ARTs), could explain the occurrence of tinnitus.
Forty-four subjects with normal hearing wore an earplug in one ear for either 4 (n = 27) or 7 days (n = 17). Thirty subjects reported tinnitus at the end of the deprivation period. ARTs were measured before the earplug period and immediately after taking the earplug out. At the end of the earplug period, ARTs in the plugged ear were decreased by 5.9 ± 1.1 dB in the tinnitus-positive group, and by 6.3 ± 1.1 dB in the tinnitus-negative group. In the control ear, ARTs were increased by 1.3 ± 0.8 dB in the tinnitus-positive group, and by 1.6 ± 2.0 dB in the tinnitus-negative group. There were no significant differences between the groups with 4 and 7 days of auditory deprivation.
Our results suggest that either the subcortical neurophysiological changes underlying the ART reductions might not be related to the occurrence of tinnitus, or that they might be a necessary component of the generation of tinnitus, but with additional changes at a higher level of auditory processing required to give rise to tinnitus. This article is part of a Special Issue entitled: Hearing Loss, Tinnitus, Hyperacusis, Central Gain.
https://www.sciencedirect.com/science/article/pii/S030645221930168X?via=ihub
I took this from my post on Bryan Pollard's Tinnitus Talk Podcast because I believe it gets straight to the point:
Earplug Use
The proper use of hearing protection is not well defined for someone with hyperacusis. If you do not use hearing protection, you run the risk of setbacks or social isolation. If you use hearing protection too often, you run the risk of lowering tolerances further or hindering recovery. Anxiety that often accompanies protection behavior may enhance hyperacusis symptoms as it heightens loudness and pain sensations to a degree. Earplug use is a complex, individual decision that needs to be made with careful consideration of the risks of overprotection. In general, it is more natural for someone with hyperacusis to wear earplugs more often than is necessary which is why emphasis is usually placed on reducing protection.
Overprotection
The overuse of hearing protection is almost universally discouraged based on evidence that it will lower loudness thresholds over time. Risks of overprotection include increased auditory gain, anxiety-induced hypersensitivity, and reinforcement of negative associations with sound. Positive results from studies of Sound Therapy & Counseling reinforce the notion that overprotection can prevent people from building sound tolerance. These treatments emphasize a gradual increase in sound exposure rather than sound isolation. It is often recommended that those with hyperacusis walk the fine line between setbacks and overprotection rather than follow a course of isolation and hypervigilance. Practically applying this guideline is not always straightforward.
Underprotection
Increased sound exposure can lead to setbacks. A setback is a sudden drop in sound tolerance as opposed to the gradual reduction in sound tolerance that occurs during overprotection. Setbacks are expected during recovery however they are an under-researched aspect of hyperacusis. Setbacks lasting several days are common. Setbacks lasting weeks, months, or years occur less often but can be deeply discouraging. Anecdotally, it seems setback duration and setback severity reduce to a degree in time. Setback duration and severity also seem to be correlated with hyperacusis severity. While there are over 2200 posts on hyperacusis setbacks in the patient forum on chat-hyperacusis.net, no academic papers could be found using a pubmed search. Some clinicians will inform the patient that sound levels below 85 dB (equivalent to noise from heavy traffic) are safe as they are unlikely to cause long-term hearing loss. While this is comforting and good to know, the relevance to setbacks is unclear as long-term hearing loss (often outer hair cell loss) is not suspected to be related to hyperacusis setbacks. Sound levels that trigger setbacks may be dependent on baseline LDLs and the particular subtype of hyperacusis (pain or loudness). There is a glaring need for research into setbacks to assess the consequences of underprotection. Setback thresholds, duration, severity, and frequency should be studied in relation to long-term recovery. Only then should maximum "safe" sound levels be defined.
Asymmetrical Protection
There are cases of hyperacusis that affect one ear more than the other. This quickly leads to the question, "What happens if I only protect my bad ear?" There is limited research on this topic. Studies suggest that auditory gain in the protected ear will increase. If the asymmetrical symptoms are related to a contraction of the acoustic reflex, sound into the unprotected ear can trigger the reflex in the protected ear as well, which would limit the effectiveness of protection. There are similar concerns about asymmetrical protection as there are for general overprotection.
https://hyperacusisfocus.org/research/earplug-use-2/