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    Joseph H Greiner, DDS, MSD

    4.9 (17 reviews)
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    Ask the Community - Joseph H Greiner, DDS, MSD

    Review Highlights - Joseph H Greiner, DDS, MSD

    Greiner has my best interest in my mind and I cannot thank him and his staff enough for the fantastic service.

    Mentioned in 16 reviews

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    Irvine Endodontics

    Irvine Endodontics

    4.8
    (321 reviews)
    16.4 mi
    15 years in business
    Locally owned & operated

    Excellent Root Canal work! My biggest fear- staying awake! The Office Staff as well as Dr Dianat…read moreare fantastic. I was so relaxed- I worried about falling to sleep during my Root Canal process and snoring. Great service AND technology here at Irvine Endodontics!

    I got referred to Irvine Endodontics through my Dentist. Kim was friendly and efficient when…read morebooking my consultation and did the work of calling my dentist to get all my insurance information. Behgum was patient and accommodating during my consultation as I struggle with X-rays. Dr Dianat thoroughly explained my options and even called my dentist to discuss my treatment. I was a bit undecided on my treatment option but his entire staff was patient and supportive - even drawing up two treatment plans and explaining the cost differences to me (thanks Kim and Lailia). I ended getting a root canal (my first one) and the process from start to finish was painless and the best experience one could hope for. Behgum assisted during my root canal and made me feel at ease right from the preparation stages. She is kind and provides intentional care throughout the process, checking in to make sure I was ok and explaining where we were in the process. She helped me through at least six X-rays and it was a breeze! Everyone showed kindness, support and the highest level of care. Dr. Dianat performed his work quickly and I felt no pain during the procedure. They are truly professionals at what they do and I would recommend this office to anyone who needs a root canal.

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    Irvine Endodontics
    Irvine Endodontics
    Irvine Endodontics

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    Apex Endodontics

    Apex Endodontics

    4.5
    (59 reviews)
    2.2 mi

    I received outstanding care from Dr. Sean Lin and his staff at Apex Endodontics. I underwent a root…read morecanal retreatment and Dr. Lin's skill and professionalism made the entire experience comfortable. I felt no pain from the local anesthesia through the completion of the procedure and he clearly explained each step along the way. The entire team provided exceptional care and service. I highly recommend Dr. Lin and Apex Endodontics.

    My entire experience at Apex Endodontics was great! The front desk staff is friendly and the…read morewaiting area is clean and tidy. Minimal wait time for your scheduled appointment, which helps with the anxiety of having a procedure done. I had a root canal with surgical repair at the gum line, treated by Dr. Sean Lin. He did a great job and talked me through the whole procedure, consistently asking me if I was doing ok, describing the procedure as it was being done and what would happen next. His assistant was also very nice, informative and helpful. My root canal was virtually painless and he did a great job with the surgical repair of my gum line. A little inconvenient for about a week but otherwise stitches cane out a week later and everything healed nicely. I would highly recommend Apex Endodontics. Dr. Sean Lin checked all the boxes: professional, knowledgeable, courteous and reassuring approach, which helps ease any anxiety. Thank you!

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    Our New Location: 558 S. Harbor Blvd at Water St.
    Our New Location: 558 S. Harbor Blvd at Water St.
    Entry/Waiting Room
    Entry/Waiting Room
    Busy 1-man shop I guess.

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    Busy 1-man shop I guess.
    SoCal Micro Endodontics - Placentia

    SoCal Micro Endodontics - Placentia

    4.6
    (46 reviews)
    6.3 mi

    I went into the office this morning very skeptical because of some of the reviews. I was met with…read morethe complete opposite experience here. 1. The $295 fee was told to me during scheduling and I understood the need as the issue couldn't be found with a simple X-ray. Actually, no issue was found with an X-ray. If it weren't for the scan, my issue wouldn't have been found. With the pain I'm in, I am happy to pay to find answers. I know this gets people super mad that they have to pay it but that is an insurance problem. If you want to get to the root of your needs, this is probably very necessary. 2. From the moment I walked in the office until the moment I left, the entire staff was so kind to me. I asked questions, they answered. I even called when I got home because I wanted to clarify some items, they were completely informative and answered everything I needed. 3. I would have been able to get this taken care of the very next day if I needed it. That's always a plus considering the pain I'm in. Overall the process was smooth and painless. This was a consultation only and I do go in for the actual work next week. I will definitely follow up for a second part based on experience. So far, I recommend this place.

    All around great service, care and attentiveness. Recommended by my general dentist as I needed to…read moreretreat two root canals. Dr. Alexander gave me a thorough breakdown of treatment, even voicing concern of postponing until after the holidays to minimize my risk of having temporaries on for too long. He was able to perform both tooth procedures the same day with minimal discomfort, explaining what was being done in the process and actively ensuring the numbing agent did not wear out until the procedure was done. Highly recommend.

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    Dr. Azar - Endodontist
    Irma - Dental Assistant
    Irma - Dental Assistant
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    Dr. Vahdati - Endodontist

    Joseph H Greiner, DDS, MSD - endodontists - Updated August 2026

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