“Can a root canal cause tooth damage?”

Not in general

Hello, The sole purpose for a root canal treatment is to preserve and save a tooth / teeth. Unless there is presence of excessive damage of a tooth from trauma or caries insult, A root canal treatment does not cause additional damage to a tooth. A dentist, or an endodontist, is supposed to trained to conservatively access a tooth when he /she perform a root canal procedure. However, and unfortunately, I personally eye-witnessed that there are a small number of dental providers inadvertently " damaged" a significant amount of tooth structure in the process of performing root canal procedure to a point that it undermined the remaining healthy structure of a tooth. So, be cautious and be careful when you choose your dentist ! Hope that will help!

The tooth is already damaged, hence the need for root canal treatment. After the root canal, a crown is usually needed. Otherwise the tooth can fracture just by eating on it. If not restored, if the tooth fractures, you can lose the tooth. Good Luck

If you need a root canal, some damage has already taken place in your tooth,
The root canal will not cause any additional damage to your tooth.