An abscessed tooth can be fatal. It can go to the brain. I beliee they may have been fortunate enough to may have inherited good teeth. We see at least two children with eye issues though.
I'm also wondering about their concept of time. I know when my ex became so malnourished, he lost all concept of time. I thought he'd had a stroke, only he hadn't. I thought at one point he was faking, so people would take care of him, but he wasn't. (You'd have to know him...). One of the kids, usually my eldest, would go see him frequently and even stayed with him for awhile before his memory got so bad (he was old enough to choose). I'd call his house, to get in touch with my son, and he'd tell me he hadn't been there. While we were on the phone, my son would come strolling through the room, and his father would say, Well I didn't know you were here!
When we looked back, we saw when it had started. It was very strange. It wasn't until he was hospitalized that we learned of the malnutrition, and the severity. I'd even called in a wellness check, because I knew something wasn't right, and, because our son was staying there, and, thought he should come back home. They came, asked the ex some simple questions, but didn't "talk" to him, and declared him, and his living quarters, just fine. Stunned. I think that they thought I was just a disgruntled ex (anything but).
From the link below: Nutritional Deficiencies (Malnutrition)
"Deficiencies can lead to a variety of health problems.These can include
digestion problems,
skin disorders, stunted or defective bone growth, and even
dementia."
Vitamin A is a group of nutrients crucial for
eye health and functioning and reproductive health in
men and
women. It also plays a part in strengthening the
immune system against infections.
B1 deficiency/lack of thiamine.
A lack of thiamine can result in
weight loss and fatigue as well as some
cognitive symptoms such as confusion and short-term memory loss. Thiamine deficiency can also lead to
nerve and muscle damage and can affect the heart. (Often seen in long term alcohol abuse)
Niacin (
vitamin B-3) is another mineral that helps the body convert food into energy. A severe deficiency of niacin is often referred to as
pellagra...
Symptoms of pellagra include
diarrhea,
dementia, and skin disorders. You can usually treat it with a
balanced diet and vitamin B-3 supplements.
B9 Deficiency (Folate) Folate is especially important for fetal development.
Vitamin D Deficiency: A lack of this nutrient can lead to stunted or poor bone growth
Calcium Deficiency: Calcium helps your body develop strong bones and teeth. It also helps your heart, nerves, and muscles work the way they should.
Nutritional Deficiencies (Malnutrition)
https://www.healthline.com/health/malnutrition#causes