Sealants

I'm not convinced yet of the safety of sealants on teeth. If you're etching the tooth with acid aren't you doiing irrepairable damage to the enamel tubules. If that enamel is destroyed in the process, filled with epoxy and then the epoxy wears thin or completely away; doesn't that leave the tooth open for decay if the tooth is not resealed? I want to investigate this further and will perhaps change mt table clinic to this subject pending my findings.