Short answer
The most common reasons are technical problems suppressing otherwise-decent content, a single generic services page competing for keywords that need dedicated pages, thin or generic content that doesn't meet Google's stricter trust standards for medical topics, and an incomplete or inconsistent Google Business Profile undermining local visibility. Most practices find the real cause is a combination of several smaller issues rather than one dramatic mistake.
Start by ruling out technical issues
A slow-loading site, broken mobile experience, or pages that Google can't properly crawl and index will suppress rankings regardless of how good the content is. This is often the first thing worth checking, since it's relatively quick to diagnose and fixing it can produce visible movement even before any new content is added.
Check whether you have one page competing for everything
A single "our services" page trying to rank for general dentistry, cosmetic dentistry and orthodontics simultaneously will typically lose to competitors with dedicated pages for each. This is one of the most common issues we find, and also one of the most straightforward to fix, since it usually doesn't require new information, just better structure.
Consider whether your content meets a higher bar
Google applies stricter trust standards to medical content than most other topics, given the potential consequences of inaccurate health information. A practice website with thin, generic content, no visible practitioner credentials, and unclear authorship will often underperform even with reasonable technical SEO, simply because it doesn't meet the bar Google applies to this specific category.
Don't overlook the local side
An incomplete Google Business Profile, inconsistent business information across the web, or a thin, inactive review profile can all suppress local visibility even when your website itself is in reasonable shape. Since a large share of patient searches are local in intent, this is worth auditing alongside your website rather than treating them as separate problems.
How to prioritise fixing these issues if you find several at once
It is common for an audit to turn up more than one issue simultaneously, and trying to fix everything at once often means nothing gets finished properly. A reasonable order is technical health first, since it affects everything built on top of it, then Google Business Profile completeness, since it is usually quick to fix and shows fast results, then content structure, splitting combined pages into dedicated ones, and finally content depth and quality, since this is the most time-intensive to address properly and benefits from the earlier fixes already being in place.
When the answer is genuinely that your market is just highly competitive
Occasionally, a practice has done most things reasonably well, technical health is fine, content is decent, Google Business Profile is complete, and still struggles to rank simply because the specific keyword and location combination is extremely contested, several long-established, well-resourced competitors occupying the top positions for years. In this situation, the realistic answer is not a hidden mistake to fix but a longer timeline and a need to compete on genuinely differentiated content and authority, rather than expecting parity with much larger, longer-established competitors within a short period.