Split Arabic and English into two ad sets, not one bilingual ad
Run Arabic and English as two separate ad sets from day one, with separate budgets and separate creative. A single ad with Arabic on top and English underneath looks cheap and performs worse than either language alone. The copy gets shorter, the hook gets weaker, and the algorithm cannot tell you which audience actually responded. On Meta and Snapchat you split by the user's app language, not by nationality. In the clinics we run in Kuwait, the Arabic set usually books a consultation somewhere between 8 and 16 KD, and the English set between 12 and 24 KD. Both are worth running. You just need to see them separately to know that.
Then apply the rule that decides everything: never advertise in a language your front desk cannot answer in. A patient who taps an English ad at 9pm and gets a WhatsApp reply in Arabic will not book. Most clinics in Kuwait lose more bookings at that handoff than in the ad itself. Before you switch on the English set, check who is on reception Friday afternoon, who answers WhatsApp after 8pm, and which doctor can run a consultation in English without a family member translating. If the answer is nobody, put the whole budget into Arabic and hire before you widen the language.
A sensible starting split is 60 percent Arabic and 40 percent English, with a floor of 5 KD per day on each set so both have enough data to leave the learning phase. Give it three weeks, then move budget toward whichever set produces appointments that were booked and attended, not form fills. Language performance also moves with the calendar. English sets get quieter from July through August when a large part of the expat base travels, and Arabic sets pick up around Hala February and in the weeks after Eid.
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Say the treatment the way a patient says it, in both languages
Keep the clinical vocabulary out of the ad in both languages. Patients in Kuwait search in everyday words: skin cleaning, braces, a mole check, book an appointment. They do not search the terms printed on your clinic sign. Transliterated English written in Arabic letters is the clearest tell that an agency wrote the ad, and people scroll past it. On the English side, remember that most of your English-reading audience in Kuwait does not speak English as a first language. Write at the level an Indian accountant or a Filipino nurse reads comfortably. A phrase like aesthetic dermatology consultation costs you clicks in both languages.
Simple language also keeps you inside the rules. Kuwait's Ministry of Health is strict about medical advertising, and the fastest way to get an ad rejected, by the ministry or by Meta, is to promise a result. Describe what happens at the visit, who the doctor is, how long it takes, and what it costs. Do not promise an outcome, do not use before-and-after images as proof, and do not use a patient's face without written consent. Say the same thing in both languages. A claim you would not make in Arabic to a Kuwaiti family is not any safer in English.
Advertising in one language only hides you from a third of Kuwait
Roughly two-thirds of the people living in Kuwait are not Kuwaiti, and they pay cash at clinics. An Arabic-only clinic never reaches the Indian, Filipino, Sri Lankan and Western residents who fill the dental chairs in Salmiya, Hawally and Fahaheel. An English-only clinic misses Kuwaiti families almost entirely, and misses the older decision-maker at home who actually approves the treatment. There is a third group people forget as well: Egyptian, Syrian and Lebanese residents who read Arabic fine but hear heavy Kuwaiti slang as an ad written for somebody else. For that segment, a lighter neutral Arabic usually beats both the dialect and the English.
The language split matters even more on the retail side. Most clinics in Kuwait sell something over the counter, skincare after a facial, whitening kits, supplements, post-procedure creams, and that revenue usually arrives with no ad spend behind it. If you want those sales to continue between visits, put the products where a patient can buy at 11pm and pay by KNET, and give every product a proper Arabic and English page on your own store instead of trading photos over WhatsApp. Bilingual product pages then feed the same two ad sets you already built.
Test the split before you argue about it. Run the same offer in Kuwaiti Arabic and in plain English for three weeks, same budget, same landing page in the matching language, and count appointments that actually showed up. In most clinics the Arabic set wins on volume and the English set wins on ticket size, especially in dental and dermatology. That gap is the answer for your clinic, not what worked for a clinic in Salmiya with a different reception team and a different doctor.