Man good dental hygiene is one of those things you just do not think about until you’re older. Flossing, interdental, mouth wash (before brushing), regularly visiting the hygienist and dentist. Your teeth evolved to last 35-ish years, the rest only happens from hygiene.
Your own happiness is more important that somebody else’s happiness.
Not to say you shouldn’t be nice or help people, or invest in other people’s growth.
But don’t do it to the detriment of your own.