Writing on the front of the bottle. Genuine bottles have ``mL'' and ``Fl'' at the bottom. Fakes apparently don't capitalize the letters correctly. Not any more. My fakes have the fonts right.

Looking at the nail polish names when I'm picking out a color. Suzi Weiss-Fischmann agrees—and she should know. As the co-founder of O.P.I., the ubiquitous nail polish brand known for its tongue-in-cheek color names, those nail shades called I'm Sooo Swamped! and Teal the Cows Come Home are all her.

OPI is a leader in nail polish brands. It's more expensive than other brands because of the quality of the polish. I like OPI polishes however, my go to brand of nail polishes is Zoya. You get what you pay for and I believe OPI is one of the best nail polishes that's comapred to China Glaze and Essie.

OPI stands for Odontorium Products Inc. It was initially founded as a dental supply company in 1981 but later shifted its focus to the nail care industry. Today, OPI is known worldwide for its high-quality nail products and is a leading brand in the professional nail care industry.