The short answer
Use AI to brainstorm many responsive search ad headlines and descriptions, then edit every line for accuracy, character limits and landing-page match before it goes live. Prefer Google's own text customization only when your pages already state real offers clearly. Volume without review creates policy risk and disappointed callers; AI drafts plus human checks is the workable pattern.
How AI drafts ads differently
General chat tools can propose dozens of headlines and descriptions in a few minutes. That speed helps when you need more RSA assets, but the model is predicting likely wording, not checking your schedule, fees or clinical limits. Google's generative AI guidance for websites stresses fact-checking before publish; treat ad uploads the same way.
AI also tends toward plain language. A draft that says implants that look and feel natural is usually clearer for patients than advanced restorative dentistry. The risk is the opposite problem: invented benefits, fake prices and guarantees no practice can keep for every patient.
Pro tip
Ask the model for a long list, pick a smaller set that matches services you actually offer, then rewrite those lines in your voice. You are combining draft speed with human judgment, not handing the account to the model.
Headline generation
Responsive search ads allow up to 15 headlines of 30 characters each. A vague prompt like write dentist headlines produces generic lines. A useful prompt names the city or service area, the service, the search intent, the 30-character limit and proof points you can stand behind.
Include in the prompt:
- •Location patients care about
- •Main service or specialty you offer
- •Character limit (30 for headlines)
- •Target query or patient intent
- •Differentiator you can verify (hours, financing options, languages, same-week openings)
Edit default superlatives. Tools often insert best or specialist; swap those for wording your credentials support, and have your own attorney or dental board review comparative and specialty claims. Keep at least one keyword-relevant headline so combinations stay on theme.
Description writing
Descriptions allow up to 90 characters each, with up to four per RSA. Prompt for several versions that each lead with a benefit, address one objection (cost, time, anxiety) and end with a clear next step such as call today or book online, then cut anything over 90 characters.
Strip absolute outcome claims such as painless, guaranteed results or 100 percent success. Pricing lines such as starting at must match a real available price, with conditions on the landing page. Free consultation language belongs only when the visit is truly free under the terms you publish.
Inside Google Ads, text customization (under AI Max for Search) can add Google-generated headlines and descriptions grounded in your landing page, existing ads and keywords. Assets are reviewed at least every 48 hours and serve only when predicted to outperform your uploads. Keep your own RSA filled; thin or misleading pages will produce thin or misleading generated lines.
Editing AI-generated copy
- •Accuracy: if a draft says 30-minute visits and you book 60, change it.
- •Jargon: replace clinical buzzwords with words patients search for.
- •Numbers: delete satisfaction rates, patient counts and timelines you cannot support from your own records.
- •CTA: prefer schedule your exam over learn more.
- •Length: recount after every edit; Google may shorten lines with an ellipsis in some formats.
Landing page experience is part of Quality Score. If the ad promises a free implant consult, the destination page must say the same thing in plain view.
Testing AI-assisted copy
Google already tests RSA combinations for you. Your job is to feed diverse, accurate assets and read the asset and combination reports. Practical approaches:
- •Mix your best existing lines with edited AI drafts in one strong RSA aimed at Good or Excellent Ad Strength.
- •Or add a second RSA in the same ad group (Google's RSA help notes gains when advertisers move from one RSA toward two or three), then compare conversions and cost per conversion.
- •Pin only required text (for example a disclaimer that must always show). Heavy pinning reduces combinations and can hurt Ad Strength.
Judge winners on booked leads or cost per conversion over a period with enough conversions to trust, not on a short CTR spike. Our ads not generating leads guide covers tracking first.
Common mistakes to avoid
- •Uploading model output without edits
- •Claims you cannot prove (fastest, pain-free, guaranteed)
- •Identical prompts that make every local competitor sound the same; add practice-specific detail
- •Ignoring mobile previews where descriptions can shorten
- •Ad and landing page mismatch
- •Turning on text customization while the landing page is thin, outdated or inaccurate
Add eligible assets (sitelinks, callouts, call, location) so the ad can show more useful detail than headlines alone. For ongoing management, see our PPC service overview.
Sources
Frequently Asked Questions
Can AI write finished Google Ads copy by itself?
No. Generative tools are good at drafting many headline and description options quickly, but models predict likely wording and can invent benefits you do not offer. Google's generative AI guidance for websites says to fact-check AI output before publishing; the same habit applies before you upload ads.
What character limits should I put in the prompt?
For responsive search ads, Google allows up to 30 characters per headline and 90 per description. Say those limits in the prompt, then recount every line in a character counter before you upload. Wider characters can still truncate in some layouts even when the count looks fine.
What is Google's text customization feature?
Text customization (part of AI Max for Search) can generate extra headlines and descriptions from your landing page, existing ads and keywords. Generated assets refresh at least every 48 hours and only serve when predicted to beat your uploaded lines. Keep your own assets filled in; do not turn the feature on with a thin or inaccurate landing page.
How should I test AI drafts against my current ads?
Add strong AI-assisted lines into an RSA alongside your best human lines, or run a second RSA in the same ad group, then compare conversions and cost per conversion over a period with enough conversions to trust, not a fixed day count. Pin only text that must always appear.
What claims should I strip from AI drafts?
Remove guarantees, pain-free promises, unverified superlatives such as best or fastest, prices that are not really available and any service you do not offer. Align every claim with the landing page. Have your own attorney or dental board review credential and comparative wording.