I found this article on the CareFair website and thought it was useful.

Try a Comfrey Foot Bath for an Ingrown Toenail

Toenails that have grown into the flesh of the foot can be painful and long-lasting. Ingrown toenails can be caused by ill fitting shoes, improper trimming, a toe injury, an infection or they can be genetic. The next time you have an ingrown toenail try treating your toes with a comfrey root foot bath.

Fill a plastic shoebox or other small container with ½ gallon of warm water, and ½ ounce of comfrey root. Soak the affected foot for 20 minutes, and then use a tissue or piece of cotton under the nail to keep it from curling into the skin. Comfrey root can be purchase online and at health stores. Seek medical attention if your ingrown toenail has not improved in a few days, or has become infected.

Soak Brittle Toenails in Sesame Oil

You can soak broken, brittle toenails in sesame oil to strengthen and protect them. Warm some of the oil by itself or with some olive oil and soak your toes for 10 minutes at a time. Sesame oil is an Ayurvedic remedy for brittle nails.

Remove Polish Stains with Denture Cleaner

If nail polish stains plague your precious toes, pop a denture tablet
into a container with warm water and soak your toenails. The cleaner should help remove stains, and if it needs some extra help use a toothbrush to scrub toenails.

Cut Toenails Straight Across

One way to avoid ingrown toenails, nail infections and nails growing in
crooked and painfully is to make sure to cut toenails straight across when manicuring. When the nails are cut straight the side of the toenail has no chance to dig into your skin.

Clean and Disinfect Cuts Promptly

When you stub your toe or cut a toenail down too far and cause it to bleed, clean and disinfect the cut as soon as it occurs to avoid germ contamination and infection. Pour a capful of full-strength hydrogen
peroxide on the sore and let it breathe to allow the cut to heal.

Eat Lots of Omega-6 Fatty Acids and Biotin for Healthy Toenails

A diet rich in foods with omega-6 fatty acids is beneficial for toenail strength. Eat cold-water fish to get more in your diet, like salmon. Biotin is also known as vitamin B7 and is important in breaking down fatty acids and aiding cell growth. You can get more biotin in your diet by eating lentils, peanuts and soybeans.

There are a couple of interesting remedies in this article that I’ve never heard of before. I didn’t know the power of sesame oil or comfrey root.

Another solution for removing stains is Bubble White, you can find it or something similar at most beauty supply stores. Also, I highly recommend taking Biotin supplements or eating biotin rich foods if you want your nails to grow faster. I take 2000 mcg of Biotin daily. Of course, I’m not a doctor so you should always check with one before starting any supplement. And a word of warning. Biotin will not only make your nails grow faster but your hair too, ALL your hair. My razor hates me.