Dr. Jack Marks, DDS
NPI 1043544034 · Illinois Department of Financial and Professional Regulation, checked Sep 2026 · named on its business listing
General dentist · The Loop
Millennium Park Smiles
25 E Washington St #1707, Chicago, IL 60602
4.5+ stars in 250+ reviews
Opening hours below
Reviews
4.5+ stars in 250+ reviews
4–5 stars: 96% · 1–2 stars: 3% · 238 written reviews
Last 12 months: 108 reviews · 99% 4–5 stars (was 94%) · Replies: 96% of reviews · 5 of 8 one- and two-star
49mention friendly, welcoming staff
13mention gentle, thorough cleanings
9mention a clean office
- 8 insurers named
Gentle care, as reviewers describe it, and daytime hours
Thirteen reviews describe cleanings as gentle and painless, and nine reviews describe gentle treatment without naming who gave it. Hours are daytime only, ending at 4 pm Monday to Thursday and 2 pm on Friday. Low ratings are rare, at 3% of its reviews.
Fact-checked · How we write these
What patients say
How the visit felt
13Gentle, thorough cleanings
9A gentle touch
6Explaining everything before doing it
Staff and office
49Friendly, welcoming staff
9A clean office
5An honest dentist
Replies reach most reviews
The practice replies to 96% of its reviews, among the highest of the Chicago practices we list.
- One- and two-star reviews
- 3%of 238 written reviews
- A lower share than 64% of Chicago practices
- Middle Chicago practice: 5%
- Most common complaints
- Charged more than they were told2Disorganized office2Insurance problems2
- Of its 5 one- and two-star reviews since Oct 2023 · Read them below
- 4–5 star reviews
- 99%in the last 12 months, up from 94%
- Share of written reviews giving 4–5 stars
- Replies to reviews
- 96%of written reviews get a reply (5 of 8 one- and two-star)
- More replies than 91% of Chicago practices
- Middle Chicago practice: 33%
- Licensed in Illinois since
- 1963its longest-licensed confirmed dentist
- Licensed longer than 100% of Chicago dentists we list
- Middle Chicago dentist: first licensed 2007
Some bad reviews cite disorganization
Two bad reviews since Oct 2023 describe a disorganized office.
Why they were unhappy
-
Charged more than they were told2None in the last 12 months
-
Disorganized office2None in the last 12 months
-
Insurance problems2None in the last 12 months
One- and two-star reviews by quarter
1
1
1
1
1
Quarters · the last one partial
Its website estimates costs before treatment
Before treatment, its website says it verifies coverage and estimates out-of-pocket costs. Its website says it accepts FSA/HSA funds and offers Sunbit financing with a soft credit check.
Ways to pay
- Accepts credit cards, debit cards and mobile pay (its business profile)
- Names Aetna, Blue Cross Blue Shield, Cigna, Delta Dental and 4 more (its website, not a network check)
- Accepts CareCredit (its website)
- Sunbit financing (its website)
- Takes American Express and Discover (its website)
Its website places the office near Millennium Park transit
Its website places the office steps from Millennium Park, near Washington/Wabash and State/Lake CTA stations, Millennium Station, and several bus routes.
Who you'll see
Dr. Reid Sigman, DDS
NPI 1558695502 · Illinois Department of Financial and Professional Regulation, checked Sep 2026 · named on its business listing
What they can help with
Also listed on its website
-
Braces & Invisalign
1 page on its website
-
Veneers & cosmetic
1 page on its website
-
Teeth whitening
Listed on its business profile
Equipment and memberships
- Equipment and treatments on its website
- Digital Impressions
Your review of Millennium Park Smiles
No account needed · read by us before it goes up
When you can go
- Weekends
- Closed
Mon
8 am–4 pm
Tue
8 am–4 pm
Wed
8 am–4 pm
Thu
8 am–4 pm
Fri
8 am–2 pm
Sat
Closed
Sun
Closed
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Hours from its listing. Check when you call.
Getting there
25 E Washington St #1707Chicago, IL 60602 Get directions
- Wheelchair-accessible entrance, parking and restroom
- LGBTQ+ friendly
- Free parking lot
Its business profile
In the practice's words
Its own business description
“Our professional staff will help you feel welcome and comfortable as we strive to provide the highest standard of personalized dental care in the most gentle and efficient way possible. We want you to enjoy a happy, beautiful smile your entire life. And we’d like to see that smile while you’re still in our office. …”
Ready to call?
Sources and dates
Business listing and reviews, Sep 2026 · mpschicago.com, Sep 2026 · NPI registry · City of Chicago community areas