You can sharpen electric razor blades with sandpaper by using a medium-grit paper and lightly running it over the blade.
Electric razor blades can’t be sharpened with sandpaper. Toothpaste can be used to sharpen electric razor blades. The metal lips that form at the edges of the holes in the screens from the blades rubbing over them are removed.
Will Toothpaste Sharpen Electric Razor Blades?
The blades don’t get dull. Toothpaste helps clean teeth. The metal lips that form at the edges of the holes in the screens from the blades rubbing over them are removed when we apply toothpaste to the razor instead of our teeth. 
How Do I Make My Razor Blades Sharp Again?
A blade cleaning solution or dish soap can be used. If you want to get the best results, you should soak the razor in the warm water for 15 to 30 minutes. Before you start stropping, make sure your razor is dry. 
Can Electric Shaver Blades Be Sharpened?
The answer is no. The electric razor can last a lifetime with proper care, but its blades can’t. Every time you shave, the blades become less and less sharp. The sharpening of the blades is only for a short time. 
How Do You Make A Dull Razor Blade Sharper?
Run your razor along your arm. About 10 – 15 times, use quick, short strokes. An old fashioned leather strop is a piece of leather used for sharpening blades. In the same way a strop makes a blade sharper, so should your arm. 
What Can I Use To Lubricate An Electric Razor?
The first option is to use a light mineral oil, like hair clipper oil, which will work great for lubricating the blades of an electric shaver. Sewing machine oil can be found on various forums and articles. 
Frank Harmenstein is the lead editor of the grooming website Cut Throat Straight Razor, and has over 15 years of experience in the industry. He’s personally tested and reviewed over 200 different straight razors, and has written countless articles on the subject.