I do not know what to say - if you do no want to believe people with experience, it is up to you. Eventually you will confirm all , that we say.
Frankly, local dentists do not care about your experience from another country. Majority thinks that we practiced with pliers in a jungle. Only local experience as a dental assistant is valued.
If you are able to get licensed as a dental assistant, it would be better in a long run. Make sure you are not taken advantage of and only perform duties permitted by your license. In USA you would be liable for damages if something goes wrong and patient sues you.
You may know more, but you would not be payed more for it