HOME remedies to treat a severe toothache are only temporary measures which people can use to alleviate acute pain. None is designed to be the long-term solution or cure. In fact, the longer one delays having definitive treatment from a dental professional, instead of relying wholly on emergency home relief, the more the situation will worsen.
It cannot be overstated that many situations that require emergency dental intervention could have been avoided in the first place. For example, teeth do not become diseased overnight. A scheduled dental appointment would have confronted an incipient carious tooth or excess calculus long before.
Anyway, you may ask, “If I suddenly get a toothache, what can I do about it other than immediately going to see a dentist (which at this time is unlikely)?” You may want to try one of these as a temporary measure for alleviation.

The easiest self-treatment is placing a cold compress on the cheek corresponding to the affected tooth. Also, use the Rule of Threes, which states that you take three ibuprofen (250 mg) tablets three times a day for three days. Motrin is recommended. You should start with a double dose. With a larger strength, which is more convenient to take, you will obviously use fewer tablets.
Another remedy is to take a tiny cotton ball soaked in clove oil (pulverise a few cloves in a drop of olive oil or any mineral oil) and use that to plug the cavity. Cold is the only physical agent known which can subdue the process of inflammation because it is inflammation that causes pain and swelling. Occasionally, it would help if cold water were held in the mouth. But one should be careful when using cold or heat on aching teeth.

By rinsing with three per cent hydrogen peroxide mixed with an equal part of water, or by rinsing with simple salt water, a toothache can disappear.
If, for some reason, there is an increase in blood pressure, a toothache can be a side effect. Clearly, the pulp chamber cannot distend to accommodate the changes in pressure because it is located at the centre of the tooth. The augmented pressure therefore compresses the nerves, which results in the pain. Elevating the head can decrease pressure. This method may be found to be useful when a toothache attacks during the hours of slumber. However, even if relief is achieved, if the pain wakes you up at night, it is serious for the tooth.
Tooth pain after eating sweets means that the acid produced from the converted sugar is acting on exposed nerve endings in the cavity. The way to resist this is to neutralise the acid. A home remedy is to rinse the mouth with a solution of baking soda. Baking powder has some sodium bicarbonate in it, and this can also be used.

To achieve emergency relief from a toothache, one may have to clean out the cavity (the direct application of alcohol in the cavity usually numbs it for a short while) and then plug it completely with sugar-free chewing gum. Apart from this, aloe vera is known to have a soothing effect on achy gums and teeth, just by applying a small amount of the fleshy part to the affected area.
Garlic can provide quick relief due to its antibiotic properties, which help fight infections. Just chew a clove of it, and the pain goes away. Similarly, an onion gives an identical result by placing a slice on the problematic tooth. Peppermint is the only herb I know that you can boil and drink as a tea to help alleviate a toothache. You can also grind up the leaves and place them directly on the cavity. It’s a fine natural remedy for toothache because it contains menthol, which numbs nerves as well as possesses antibacterial effects. The crushed leaves in water can be an excellent mouth rinse. Finally, fine leaf thyme mashed and mixed in water and used as a mouthwash is good to ease terrible toothaches.