OK guys: Disclaimer: Anything I'm about to type here is strictly general advise. It may not be the best advise for you and your specific situation. If your ingrown toenail lasts more than 2-3 days, see your podiatrist.
In order to prevent the most common cause of ingrown toenails, cut the nail straight across. If you have an ingrown toe nail, you can soak it in warm water (not hot), some white distilled vinegar and table salt for 5- 10 minutes (not 30-40 minutes). Put some neosporin, bacitracin, polysporin or triple antibiotic ointment on it with a bandaid. Do both of these things twice a day. If it's not gone in 2-3 days GO TO YOUR PODIATRIST!
A little story about having a procedure done: My fiance had one. She let it go until 2 days before our wedding. I had to do a nail procedure on it two days before our wedding. She was in agony before letting me do it. After I did it, she was in such relief, she still married me and had no pain on our wedding day. She also danced any dance she wanted. Instead of doing the soaks I usually prescribe, she soaked it in the Atlantic Ocean in St. Thomas for the next week.
I get complete strangers coming up to me at the local mall thanking me for taking care of their wife's, husband's, son's, daughter's ingrown toe nail. It's a benign procedure, and it gets rid of the pain. If it's badly infected, the podiatrist may not want to do a permanent procedure due to the risk of infecting the bone under the nail. In that case, it can be done temporarily, but about 50% come back ingrown in about 6 months. The permanent procedure rarely comes back.
If you let them go for long periods of time (that is a reletive statement), the bone can get infected under the nail. You don't want that. It means surgery to remove the infected part of the bone and possibly 6 weeks of IV antibiotics. It's rare, but I've had to take care for that. If you have diabetes or other medical concerns, don't wait 2- 3 days. Call your podiatrist now!
I can make recommendations for podiatrists in NY (NYC, Long Island, parts of upstate, Albany, Rochester), FL, Nashville, Memphis, Houston, LA and Atlanta. Those are the places I personally know podiatrists that I can think of right now.