Nowadays, toothpaste generally has grinding effect, so it has a strong cleaning effect on gold surface. Secondly, gold has very low chemical activity and can be washed with toothpaste. Generally, if it is K gold, it needs to be polished and electroplated again at the after-sales service point, usually around 15-20 yuan; If it is platinum, toothpaste can restore brightness, but the brightness after re-polishing is better; If it is gold, take it and burn it; If it is palladium, it needs to be electroplated again.