In a nutshell, yes and no. Silencers aid in protecting your hearing but are not the end all of the task.
When silencers began to become more mainstream some 20 years ago there was all this hype about “hearing safe” silencers and how they had to be under this level or that level to “protect” your hearing. What this is based on is the OSHA threshold of 140dB and to be honest about it, this is still too high…