There’s really no ‘standard’. It’s always up to the employer to choose whether to offer dental and vision (they’re not required by law). And then it’s up to the employer to choose what to contribute.
Below is a benchmark study on benefits by SHRM (kind of a deep dive). Another article (see below) seems to indicate that some employers offer 20-30% contribution, but many don’t offer the benefit at all. The last article shows what dental and vision typically cost. Some employers who don’t contribute to dental and vision premiums offer employees a flex spending account or health savings account instead to offset the cost of premiums. Are you an employer, or an employee? If you’re an employer, we also offer suggestions on how to get the best rates for you and your employees. Sincerely, Laura, HR