As it's my long term career I've obviously seen and fixed these issues countless times.
Just because it worked for you doesn't mean it's good advice.
Silver should never be worn long term, especially for people with sensitivities. It can oxidise and permanently mark the skin (that's why they go black).
9ct or plated gold also isn't suitable, its mystery metal with a coating.
Plastic is porous and can harbour bacteria.
Tea trea, other oils etc are far to harsh, sterile saline is all that's needed.
Your best bet is to visit a reputable piercer for appropriate fitting and appropriate materials.
If you had an issue with your car you'd visit a mechanic, issue with piercings ask a piercer.
People are still getting gun piercings and twisting them for 6 weeks. Yes they may heal but they would heal quicker if pierced appropriately and left alone. Just because something worked for someone else doesn't make it good advice.