The 10 beauty products Yahoo readers bought the most last month

One of October's top sellers was this face cream, and it's easy to see why. Not only does it help regenerate skin and hair, but it also contains the ingredient tepezcohuite, which is Salma Hayek's secret weapon for youthful-looking skin.

With more than 43,000 five-star reviews from verified shoppers, this serum has a massive fan base, many of whom rave about how hydrated and bright their skin feels after use. Our beauty editor is also a fan: "I saw a noticeable improvement in my skin's texture within the first day and even more so after two weeks. My skin was more supple, my fine lines appeared less deep and my face appeared generally more even and had a sort of glow."

Amazon's No. 1 bestselling Lash Princess Mascara features a conically shaped fiber brush that gives the effect of false lashes. Its handy wand sculpts individual lashes to make them longer and more voluminous. And at $5, you can't beat the price.

This genius formula is made entirely of plant-based ingredients, including aloe vera juice, witch hazel, jojoba oil, hyaluronic acid and, of course, vitamin C. The powerful botanical ingredients work together to smooth, hydrate and even out your skin while lightening dark spots and hiding imperfections. 

This handy hair tool brushes your hair while simultaneously straightening it. The clever gadget uses ionic technology to help tame frizz and leave your hair looking and feeling smooth and shiny. "I have long, wavy hair, and if I don't straighten it or curl it, it just looks wild and frizzy. This little gadget has cut down the time it takes me to do my hair in the morning to around 5 to 7 minutes. This is the only tool I take with me on trips, which is great because it is so lightweight. Love it!" raved one happy shopper. 

If your smile isn't as bright as it used to be, these at-home whitening pens may be a way to get around the hassle — and considerable expense — of professional whitening treatments. The pen uses a brush tip as an applicator. You just twist the bottom to release the gel into the brush, then spread the whitening gel on your teeth.

This comprehensive 3D Whitestrips kit is one of the most popular tooth-whitening treatments on Amazon thanks to its pro-level smile-brightening effects. It also purports to remove up to 25 years of teeth stains.

This professional-grade flosser promises to get your teeth clean and gums flossed — even those hard-to-reach back teeth. The included timer measures 90 seconds to keep you on track with proper flossing time, and its 360-degree tip rotation ensures all areas of your mouth are truly clean. It's designed to remove 99.9% of plaque, and Waterpik claims that it's up to 50% more effective than dental floss alone.

Keep your skin hydrated and make sure your makeup stays in place all day with this popular primer. Shoppers say the lightweight formula absorbs into the skin quickly and doesn't leave behind a sticky feeling. "My skin looks so smooth. I’ve finally found the perfect primer. It’s really remarkable," raved one. 

Dump the clump and say hello to naturally fuller-looking lashes. Equipped with mini-tines, this beloved gadget separates your mascara-coated lashes for a clump-free finish that'll make everyone wonder if you're even wearing eye makeup at all.