I have been plagued with tooth decay, bone loss, and gum recession problems over the decades, and some of the tooth
'decay' turns out to really be tooth
and bone 'resorption'. Which is a syndrome where the teeth start eroding away within, or at the root, due to 'unknown' autoimmune processes. Read the dental literature on resorption, then consider that HCV probably triggers localized autoimmune reactions in the teeth and gums, causing this 'erosion'.