Two plan shapes, one way to price them
A DHMO is a prepaid plan: a flat monthly fee, care from a network dentist, and usually no deductible or annual maximum. A PPO or DPO plan is premium plus a share: you pay a coinsurance tier toward covered work, up to an annual maximum, and you can go out of network at a lower rate. This page models the PPO shape, because that is where the comparison between premiums and payouts lives.
The distinction matters before you type anything. A DHMO quote entered here still produces a number, but the model reads its fee as a premium and its copayments as a plan share, which is not how a prepaid plan works. If the quote in front of you has no annual maximum and no coinsurance percentage, the arithmetic below is describing a different product.
For a PPO quote the five fields are the whole model: the monthly premium, the preventive-tier work (cleanings and exams) paid at 100%, the rest of the year of work, the share the plan pays toward it, and the plan annual maximum. Everything printed on the page is built from those inputs.
The insured year
The plan collects the premium either way. Toward your work it pays its share, never above the annual maximum; you pay the rest. What you enter as the preventive tier - cleanings and exams - is paid at 100% before the plan share applies to the rest. The insured year is therefore twelve months of premium plus the part of the bill the plan did not cover, and the uninsured year is the same bill paid directly to the dentist.
At the defaults - $45 a month, $1,200 of work, a 50% share and a $1,500 maximum - the premium is $540, the plan pays $600, you pay $600, and the insured year costs $1,140 against $1,200 paid directly, a gain of $60. Change only the work and the premium stays put: the six-row table runs $0, $300, $600, $1,200, $2,400 and $4,800 of dental work through the same plan.
An annual maximum of 0 means the plan has no cap at all, not that it pays nothing: it keeps paying its share of every dollar of work. The page says this twice, in the field help and in a note shown when the value is 0, because the opposite reading would turn an unlimited plan into a useless one. To model a plan that pays nothing, set the share to 0%.
Where it breaks even
The plan pays for itself where paying directly equals paying the premium: the break-even bill is the annual premium divided by the plan share. At $540 of premiums and a 50% share that is $1,080 of dental work; below it the plan has not returned its premiums, above it the plan is ahead. The page prints that figure and states which side of it your own year falls on.
Two cases produce no break-even at all, and the note names the one that applies instead of saying the point does not exist. A share of 0% pays nothing, so no amount of dental work brings back a cent of the premium. A maximum below the annual premium caps the plan under what it collects, so even a year at the cap leaves the insured path dearer, and raising the maximum above the premium would restore the point.
The break-even figure ignores the cap by construction: it comes from the uncapped share, which is valid only while the premium sits at or below the maximum. That is exactly why the capped case is reported as a null rather than as a number the plan could never reach.
What the page does not model
It skips waiting periods, a deductible inside the plan, out-of-network rates, orthodontia sub-limits and the probability of needing work at all. It also skips the rule the Washington page highlights: adults under 65 must buy dental in conjunction with a Qualified Health Plan through Healthplanfinder, while pediatric dental is an essential health benefit in its own right.
The plan share is applied to the price you would pay directly, with no adjustment for the allowed amount a PPO negotiates. In a year where the bill runs past the annual maximum, that makes the page optimistic about what the carrier actually pays, because the real payout is a percentage of a lower allowed charge.
Only the policy contract settles a claim. This page answers one narrower question - whether the premium, the share and the cap leave you better or worse off than paying the dentist yourself - and leaves network discounts, claim-by-claim decisions and the rest of the contract where they belong.
Danfio