Poor digestion can be caused by defective mastication of the food in the mouth.

消化不良可能是因为嘴里的食物没有完全嚼碎而引起的。

《柯林斯英汉双解大词典》

Poor teeth mean poor digestion and poor digestion means poor nutrition.

牙齿不好就意味着消化不好，而消化不好就意味着营养吸收不好。

youdao

Such a diet so high in protein is very hard on those with poor digestion.

这样一种高蛋白质饮食，对消化不良者是非常大的负担。

youdao

Tooth decay and gum disease are major public health problems, associated with poor digestion, heart attacks, strokes and cancers, stemming from inflammation and subsequent infections.

MSN: Let Kids Gorge on Halloween Candy, Dentists Say