Peanut allergies, Autism , heart disease, etc increase when conditions allow recessive traits to exist or even flourish because of abundance of resources to deal with those traits/ diseases

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I shoulf really get rid of sugary stuff

Thats interesting. I remember there was a tree whose branches were good for your teeth.

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In general, a larger population increases the power of natural selection and reduces the rate that alleles lost by random chance. Both of these increase the robustness of a population over time.

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Lack of selection means many unfit genes propagate where harsher environmental conditions would have resulted in their demise. Genetically the benefits of rapid population growth are a larger gene pool from which future generations could draw to endure something like a pandemic that removes a large fraction of population.

They did! Atleast in some population, but not to the same extend as we do. There were teeths that had sign of abrasion that were not due to food or foreign particle, but most likely from tooth pick. There are even dental procedure that were perform to remove cavities. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4504065/

Makeshift tooth brush from twig are used in a variety of place and, while there are not evidence, it would not be surprising if people in the past did use those.

At last, people were less prone to dental cavities, maybe 3% to 15% of teeths had cavities. Their overall dental health was just much better than ours.

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Well, on the one hand that means an expanded gene pool, and that is great, because generally this means greater potential for adaptation, and a lower risk of total species loss due to an over concentrated gene pool.

On the other hand, resources only diminish as time wears on, and people need those. The more people, the more resources are needed, the faster those resources get used up, the harder it becomes to locate required resources... Theres a whole doom spiral associated with that.

Then there is the environment itself, which, if current scientific consensus is something you care about, seems to point toward the human race being the biggest threat to itself or its habitat, although the threat we pose COULD be diminished, without diminishing our numbers. It would only require the end of for profit energy generation, end the use of combustibles as fuel for energy generation, massive advances in fusion technology, renewables and other things that don't get the funding they need because of politics and financial cartel operations.

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They didn't, and they didn't really need to.

You can still see it in tribal populations today. They don't care for their teeth at all, yet they've got perfect teeth, better than ours.

That's because their diet is very low on refined sugars, and composed mostly of fruits, vegetables and fish, with some occasional red meat.

It also reflects on their skin. They have smooth lively skin free of acne, despite not using any skin care products. That's also due to lower presence of sugars in their diet, and also because their culture doesn't drink alcohol.

This is counterintuitive, but correct. During a phase change, energy is released and absorbed by the substance. For example, when water freezes it gives off energy to the surroundings. This is why orchards spray water on their fruit during a cold snap… the heat given off by the freezing water might be enough to save the fruit from freezing too. Similarly, when the water in the ground around your basement thaws, it pulls that energy from somewhere… and that could very well be the walls, floor, and air of your living space.

Huh, never thought of that. Am reading without my glasses rn, with my left eye (and my phone 1 finger length away from my face lol). That just looks "right", when switching to the right eye it's like everything is slightly off and I want to move the phone but every direction is wrong! Weird.

Well rabies is really slow with incubation of months compared to days for others, so technically you are still giving it before the virus is even noticed by the immune system.