I'm a dental technician, and I suggest choosing light-cured materials! Convenient, quick and painless! The effect is good! Or 3M material. Gold is used for tooth restoration or inlay. Gold is used because it is not easy to have an allergic reaction to the body! Other metals, such as cobalt-chromium alloy and nickel-chromium alloy, some people will have allergic reactions after using them, which varies from person to person. It's not necessary. Of course, you can choose if you have more money. May you be healthy soon! Hope to adopt!