The 100/80/50 structure, and what it costs in practice
Nearly every dental PPO uses the same three-tier coinsurance design. Investopedia describes it as the 100/80/50 structure, and Humana's Complete Dental plan documents show the pattern in a live product: 100% for preventive care, 80% for basic services, 50% for major services, with no waiting period on preventive, six months on basic and twelve months on major.
| Category | Plan pays | Typical services | Typical waiting period |
|---|---|---|---|
| Preventive | 100% | Exams, cleanings, bitewing X-rays, fluoride, sealants | None |
| Basic | 80% | Fillings, simple extractions, root planing, some endodontics | 6 to 12 months |
| Major | 50% | Crowns, bridges, dentures, implants where covered, surgical extractions | 12 to 24 months |
| Orthodontia | 50% to a lifetime maximum | Braces and aligners, children only on many plans | 12 to 24 months |
Run the arithmetic on a realistic bad year. Suppose you need a crown at $1,400 and two fillings at $220 each, on a DPPO with a $50 deductible, $1,500 annual maximum and the structure above. The plan pays 50% of the crown, $700, and 80% of the fillings, $352, less the deductible. You pay roughly $560 plus the deductible. Against $41.76 a month, about $501 a year, the plan came out ahead. Now suppose you needed two crowns and a bridge totaling $6,000. The plan pays its $1,500 maximum and stops. You pay $4,500. The plan helped and did not protect you.
Sequence expensive work across plan years when clinically safe. If a treatment plan totals more than your annual maximum and your dentist agrees timing is flexible, completing part in December and part in January uses two annual maximums instead of one. Ask your dentist to submit a pre-treatment estimate to the carrier so you know the exact allowed amounts before work begins.
Two more mechanics worth knowing. First, coinsurance applies to the negotiated fee, not the billed fee, so an in-network 50% benefit on a crown with a $1,100 negotiated fee is better than 50% of a $1,400 out-of-network charge where balance billing may apply. Second, some plans use a graded schedule that starts at lower coinsurance in year one and improves in years two and three, which is functionally a waiting period by another name.
Vision plans, allowances, and when self-funding is the better answer
Vision plans are allowance products rather than coinsurance products. A typical design covers an annual exam with a small copay, an allowance toward frames, and a lens benefit with copays that vary by lens type. The 2025 VSP federal vision plan brochure shows the structure clearly: a $150 frame allowance, an extra $50 allowance on featured frame brands, and 20% off any amount over the allowance. Employer plans often offer tiered allowances; a 2025 employer plan comparison shows $200 and $300 VSP frame allowance tiers with separate $80 and $110 allowances at Costco and other discount retailers, reflecting those retailers' lower prices.
Because the benefit is capped and predictable, the value test is simple: add the annual premium to your expected copays and compare against paying cash. If your exam runs $95 and you buy $180 frames with basic single-vision lenses every other year, a $15 a month plan costs $180 a year against maybe $200 of biennial spending. If you wear progressive lenses, need an annual prescription change, or have a family, the plan usually wins comfortably.
When to self-fund instead
- You are a low-utilization adult. Two cleanings at cash rates in most markets run $200 to $400 a year combined with an exam and X-rays. A $41.76 DPPO premium is about $501 a year plus a deductible. If nothing else happens, you lost money.
- You have an HSA or FSA. Dental and vision expenses are qualified medical expenses. Paying cash with pre-tax dollars is an immediate 20 to 35% discount for most households, with no waiting periods, maximums or frequency limits.
- Your dentist offers an in-house membership plan. Many practices sell annual memberships covering cleanings, exams and X-rays plus a 15 to 20% discount on other work, often for $300 to $450 a year with no maximum.
- You need major work immediately. A plan with a 12 month major-services waiting period and a $1,500 maximum will not pay meaningfully for an implant this year. Price the work at cash and negotiated rates, and consider a discount plan for immediate savings without a wait.
- You already have a marketplace pediatric dental benefit. Pediatric dental and vision are ACA essential health benefits, so check what your children already have before buying a family plan.
When buying coverage clearly wins
Buy the plan if your employer subsidizes it, since group premiums of $28.70 to $30.71 monthly for a DPPO with waived waiting periods are hard to beat with cash. Buy it if you have a family with children needing sealants, fluoride and possible orthodontia. Buy it if you know from history that you average a filling or crown every couple of years. And buy the DHMO rather than the DPPO if your budget is tight and there is a participating dentist you are willing to see, since $15.14 a month with no annual maximum and immediate copay-based coverage is the best floor available in this market.
Plan designs, waiting period rules and available carriers vary by state and by whether coverage is individual or group, so confirm the schedule of benefits for your state before enrolling. If you are also shopping medical coverage, see ACA marketplace plans and our guide to HSA plans versus PPOs.
Sources & further reading
- NADP — Understanding dental benefits, average premiums and annual maximums
- NADP — Statistical reports on dental plan premiums
- Delta Dental — Dental insurance waiting periods explained
- Humana — Complete Dental plan coinsurance and waiting periods
- VSP — 2025 vision plan brochure with frame allowances
- SAIF — 2025 vision plan rates and allowance tier comparison
- HealthCare.gov — Essential health benefits including pediatric dental and vision