Cavities can affect your dental health and contribute to bad breath.
[…]
Do Cavities Cause Bad Breath?
Can Tooth Decay Cause Headaches?
If you have a toothache and a headache, you may be experiencing referred pain from tooth decay. […]
Are Dental Cavities Contagious?
yes, dental cavities can be considered contagious, as the bacteria that cause cavities can be spread through saliva, often by sharing utensils, kissing, or other close contact. […]