Baby bottle tooth decay

[Tired momma of 2]

My 3 year old was diagnosed with baby bottle tooth decay. The dentist that I went told me he was going to need fillings. I had the procedure done. The dentist put black filler instead of white in his front teeth. I've already had numerous people ask me what's wrong with his teeth. They think it's rot! What can I do now to fix this? Can a 3 year old get caps?