Piston Kit: Mercury 20-50 Hp Cross Flow Hp .040 Over Size Only - 100-05-07K

Piston Kit: Mercury 20-50 Hp Cross Flow Hp .040 Over Size Only - 100-05-07K

Marsoni

M251S

$86.96

Get it in 3 business days with 1 day shipping. Friday, May 29

Piston Kit: Mercury 20-50 Hp Cross Flow Hp .040 Over Size Only - 100-05-07KITEM#: 100 05 07K PISTON KIT MERCURY MARINER 20 50 HP CROSS FLOW 72 97 . 040 OVER OEM#: 743 3366A2, 780 9119A10 2. 605" BRAND: WSM FITMENTS: Make Model Year(s) Mariner ALL Mercury 2 Cyl 2. 565 Bore Cross Flow 20 1972 1979 Mercury 4 Cyl 2. 565 Bore Cross Flow 40 1989 1997 Mercury 4 Cyl 2. 565 Bore Cross Flow 50 1970 1985 For more information on our policies please click the Shipping and Payments tab or to ask a question click our store name for our

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I tried these on my teenage son who has pretty yellow teeth after braces. You can’t really tell in pics but in person they made a difference. He hasn’t had any odd side effects or sore gums from using them and said they were easy to use. He wears them for the recommended amount of time although started lower the first time to make sure he wasn’t allergic or anything. But so far great product and we are happy with it!

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Reviewed in the United States on February 1, 2026

Sammy Squirrel

Houston, US

★★★★★ 4

Work about as well as drugstore brands.

These are at least as good as the national brands at a fraction of the cost. They stick on easily and used as directed will whiten your teeth a few shades over the course of treatment.

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Reviewed in the United States on December 5, 2025

Verified Purchase

Sharon T.

Chelsea, US

★★★★★ 2

Combersom

Cumbersome, does not hold 3nough water

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Reviewed in the United States on May 25, 2026

Miah Quesada

New York, US

★★★★★ 3

Mixed Results

These strips fit comfortably and don’t slide around, which I appreciated. They are gentle on my gums and enamel, and I noticed a slight improvement in brightness after consistent use. That said, they aren’t as strong as some other whitening strips on the market, so if you’re looking for dramatic results you may be underwhelmed. Good for subtle whitening.

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Reviewed in the United States on October 2, 2025

Disappointed Reader

Bozeman, US

★★★★★ 5

Does work well for removing minor stains

This product is probably best for removing minor staining - things like coffee, tea, red wine. I don't think it would work for longer-term stains that accumulate with age - the strips are not powerful enough for that. Very easy to use: just apply and leave on for half an hour or until you can feel that they are no longer well-attached. The "cleaning" process starts immediately - you can see the bubbles form. I am a tea drinker, and I notice immediate effect after putting these on. Don't expect miracles, but they will help with fresh stains for sure. For me, they do not increase the sensitivity, but my teeth are generally not sensitive. But they are peroxide based, so the possibility is always there that it could have that side effect.

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Reviewed in the United States on November 1, 2025