05/23/2026
Most people think wisdom teeth only become a problem when they hurt.
But impacted wisdom teeth can quietly damage the healthy tooth beside them long before any pain starts.
When a lower wisdom tooth grows sideways or gets stuck under the gums, it can trap bacteria and food between the teeth — creating an area that is extremely difficult to clean properly.
Over time, this can lead to cavities forming on the back side of the second molar, often hidden deep below the contact point.
A clinical study published in the Journal of Clinical and Experimental Dentistry found that distal decay in the second molar occurred in about 1 in 4 cases involving impacted lower wisdom teeth. The risk was especially high when the wisdom tooth was horizontally impacted and touching the neighboring tooth near or below the gumline.
The dangerous part is that this damage can remain completely silent in the early stages.
Many patients discover the problem only after:
• deep decay develops
• food gets stuck constantly
• the second molar becomes painful
• root canal treatment is needed
• or the healthy tooth beside the wisdom tooth can no longer be saved
That’s why regular dental X-rays are important — especially if you still have impacted wisdom teeth.
Sometimes, the tooth that hurts the least can cause the most damage.
📄 Reference:
Marques J, et al. Impacted lower third molars and distal caries in the mandibular second molar. Is prophylactic removal of lower third molars justified? J Clin Exp Dent. 2017;9(6):e794-e798.
