dental issues

jlpev

OK I haven't been on here in ages but I needed advice.
My son went to the dentist, hes 4, and found out due to xrays that he had 5 cavities. 3 need caps, 1 filled & 1 pulled. I'm scared to death about it. They want him to have it done at a surgery center.
I am starting to feel like I should get a 2nd opinion.
I've been reading online about natural ways to heal teeth. I started giving him ferminated cod liver oil/high vitamin butter and just got earthpaste to maybe help heal his cavities.
I've always brushed his teeth twice a day. Started flossing every night ,& mouth wash.
I feel like I've failed him. Any suggestions or experiences would be great!!!