Gum disease
Your tooth may hurt when you bite down if you have underlying gum disease. Periodontal disease [5] is usually due to a lack of proper oral hygiene. A common symptom of gum disease is a sore tooth. You should immediately visit the dentist if you notice a sore tooth. A dental exam will be done to measure your teeth’ attachment level.
Gum disease can loosen your teeth, which can lead to other conditions such as bleeding, swollen gums, or exposed tooth roots. Gum disease requires immediate treatment to avoid complications.
Conclusion
There are several possible reasons why your tooth can hurt when you bite down and they vary from mild to severe. However, you never know which it is, which is why you must act promptly when you start to feel pain in your teeth. Proper dental hygiene is also very important to avoid any form of an underlying condition.
References
[1] https://www.nhs.uk/conditions/tooth-decay/
[2] https://www.mouthhealthy.org/en/az-topics/c/cavities
[3] https://www.healthline.com/health/cracked-tooth
[4] https://www.nhs.uk/conditions/dental-abscess/
[5] https://www.cdc.gov/oralhealth/conditions/periodontal-disease.html