Long story short, causes of toothaches include:
In a 2019 study from the University of Colorado, the authors concluded that 79% of patients (47 with anxiety and 25 with sleep deprivation) who took CBD daily for one month experienced reduced anxiety levels (8). Again, the study didn’t include a control group, so while the results are promising, we need a study with a more meticulous methodology to further confirm the results.
What Causes Toothaches?
Every time you eat food, the byproducts are metabolized by the bacteria in your mouth, which leads to lower pH levels. This can contribute to the demineralization of the teeth, which is how cavities form. Eating and drinking too often prevent the teeth from re-mineralizing or re-building their structure. Unfortunately, CBD isn’t able to directly stimulate remineralization because it’s not a building block for the process.
Pain caused by tooth sensitivity comes from the outside, unlike toothache, which originates inside the tooth. When the roots of the tooth become porous, the nerve inside gets sensitive. So if you eat ice cream or drink cold juice, it can make your teeth hurt. CBD is known for its ability to mitigate nerve pain, so it could potentially improve tooth sensitivity. However, it still remains a theory until human studies are conducted on this subject.
CBD for Dentist-Related Anxiety
Again, while not a common product, CBD toothpaste combines everything you need to relieve dental pain. On top of the CBD, toothpaste contains a fat base and additional soothing ingredients such as menthol. CBD toothpaste is considered topical because it is applied directly to the problematic area. As mentioned, you make your own CBD-infused toothpaste by simply adding CBD oil to your regular toothpaste, or from scratch, using a combination of coconut oil, CBD oil, baking soda, and peppermint drops.
According to the American Psychological Association  , stress is known to weaken the immune system. CBD isn’t just for pain relief as it has other helpful health benefits as well. Quality CBD can help with recovery and strengthening the immune system as well by reducing stress.
CBD is known to help reduce anxiety  and it has shown to have potential in treating anxiety disorders as well. In the case of your toothache, you are less likely to get sick from tooth infection since your immune system is much stronger.
What causes tooth pain?
Of course, his statement is backed by research as well. One study  in particular even compared the efficacy of cannabinoids with that of other oral care products. Results have shown that taking CBD or cannabidiol for oral health might be a good idea. Since CBD can help deal with pain and it does show to have potential as an antibacterial agent as well.