Sugar will not make your teeth hurt in any way if you are healthy, and your teeth are sound and undamaged.
If you are eating sweet foods and you feel pain, it’s because of an open connection of your underlying tooth tissue and the free oral space in any given tooth. Mostly in the case of leaking fillings where food and saliva have access or come into contact with the sensitive underlying dentin, you will experience pain.
Eroded teeth and enamel worn teeth will also show sensitivity and pain; think of sensitive tooth necks. Sometimes anatomical issues like deep and profound fissures in permanent molars may cause sensitivity(see photo). In this case, sealing is a treatment option also for the prevention of developing cavities.
Saliva plays a role in the remineralization process of enamel. When having a dry mouth due to medication side effects, dental sensitivity problems may occur more frequently.
Don’t blame the sugar, check your cavities, fillings, and erosions instead.
You might have gum disease if certain foods cause you pain like that, because that pain is from the roots of your teeth. Acidic (like fruit juice) and bitter (like chocolate or coffee) foods are most noticeable I think.
Heathy gums meet the teeth near their tops, but with gum disease you can have deeper “pockets” between tooth and gum where food can work its way in and hit the roots.
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