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Answers. Best Answer: It's fine to reuse ear plugs as long as you clean your ears each time before inserting them. You'll need to replace them occasionally, depending on how often they're used. I've found that the yellow cylindrical ones work better and stay clean longer than the standard orange ones.
Because there is a model that offers a NRR of 33, does that mean your supply of NRR 29 earplugs is unsafe7 The correct answer is no, unless the exposure time and noise levels require that level of protection, finder most workplace noise conditions, a NRR of 29 offers excellent protection.