Dental should REALLY be covered. Not only can dental problems have major non-dental repercussions, but regular dental check ups are a super way to catch oral cancer early. My hygienist started groping around my cheeks and gums a couple years ago and when I asked why, she explained about the oral cancer thing. It's a bigger deal for tobacco users, but worth checking on everyone since it's literally 10 seconds or less and requires no equipment or drugs. Actually optometric care is also an excellent way to catch non-eye related conditions, such as diabetes.