A Story From the Field: The Clinic the Market Has Trusted for Years

Dr Nid is a dentist who has run a single-dentist practice in a two-unit shophouse near Photharam market, Ratchaburi, for almost ten years. Most of her patients are market vendors, older people coming in for dentures, and schoolchildren brought in by their parents for fillings. On the ground floor are a small waiting room, a reception counter, a surgery with two dental units, a compact dental X-ray room and a room for cleaning and sterilising instruments. The air compressor and suction system sit at the back of the building.

During the 2026 floods, water from the Mae Klong River flowed into Photharam market and flooded the clinic's ground floor to about mid-shin height for several days. Dr Nid and her assistant managed to carry some instruments and records upstairs, but the dental chairs, the bases of the cabinets and the X-ray room floor all sat in water. When it receded, the clinic smelled musty and muddy. Black mold spots appeared along the waterline on the waiting-room walls, the waiting-room sofa was soaked through, and the X-ray room, the most tightly sealed room in the clinic, smelled worst of all because it has no window.

Dr Nid knows that every dental instrument must be cleaned and sterilised in the autoclave to the clinic's standards, as always. Her question is different: how does the whole room become clean enough again for her older patients and young children? This article separates clearly what belongs to environmental disinfection and ozone treatment, and what remains the job of the clinic's existing standards.

Drawing a Clear Line: The Clinic Environment Versus Dental Instruments

World Health Disinfection (WHD) services do not replace instrument sterilisation, and they do not replace the inspection or servicing of medical equipment. Their role is to make the environment that instruments and patients sit in clean again, free from mold and musty odor.

Keeping this line clear protects everyone. The dentist keeps full control of clinical infection-control decisions, technicians remain responsible for the safety and function of medical equipment, and our team focuses on what we do best: reducing germs, mold spores and odor in the rooms where patients wait, sit and are examined. When each part is handled by the right people, the clinic can reopen faster and with far fewer unanswered questions.

Why the Dental X-Ray Room Needs Special Care

• A sealed room with no window. X-ray rooms are designed to be enclosed for radiation safety, so post-flood moisture has nowhere to go and musty odor builds up more strongly than anywhere else.
• Special walls and doors. Walls or doors with radiation shielding inside should be checked by a specialist if they were flooded. Do not drill into them or strip them yourself looking for mold.
• Delicate electronics. The X-ray unit, digital sensors and the image-reading computer must be moved out or covered as the technician advises before any fogging or ozone treatment.
• Patients in close quarters. Patients have to bite on a film or sensor and keep still in a small room. If that room smells musty, their experience suffers immediately.

Radiation safety and the inspection of X-ray equipment after a flood should be discussed with your equipment service provider and handled according to the requirements of the relevant authorities. These matters are outside the scope of disinfection and ozone services.

Why Market Shophouses in Photharam Stay Damp for So Long

Many clinics, pharmacies and shops around Photharam market operate from older concrete shophouses close to the Mae Klong. These buildings share a few features that slow recovery after a flood:

• Deep, narrow floor plans. Shophouses are long and narrow, with windows only at the front and sometimes the back. The middle rooms, which is often where the surgery and X-ray room sit, get very little airflow.
• Shared walls with neighbours. Moisture and odor from a flooded shop next door can seep through a shared wall into the clinic.
• Tiled floors over concrete slabs. Water trapped under tiles or in the screed dries slowly and can keep releasing a damp smell for weeks.
• Roller shutters kept closed. While a clinic is shut for repairs, the front shutter is usually down, sealing moisture in.

Knowing this helps explain why a clinic can still smell musty weeks after the water has gone, and why drying, disinfection and ozone treatment work best when planned together.

The Risks a Dental Clinic Has to Think About After a Flood

• Vulnerable patients. Older people, children and patients with chronic conditions are more sensitive to mold spores and germs in the environment. (This article is not medical advice. Anyone with health concerns should talk to their doctor.)
• The team's health. Dental assistants who waded through floodwater during the clean-up are at risk of skin infections and leptospirosis. A high fever or aching calves after being in floodwater is a reason to see a doctor.
• Patient confidence. A dental clinic is a place where patients expect the highest standard of cleanliness. Even a faint musty smell can make them hesitate.
• Lost income. In a single-dentist practice, every day closed is a day with no income at all.
• Expensive assets. Dental units and X-ray equipment are costly. Lingering humidity and mold can shorten their working life.

What Clinics Often Try That Is Not Enough on Its Own

• Wiping every surface daily with the clinic's usual disinfectant. Good for touch surfaces, but it does not reach mold inside walls, on ceilings or in the air of a sealed room.
• Running the air conditioning and air purifiers non-stop. This helps a little, but if an air conditioner was flooded or has mold inside, it becomes a spore distributor.
• Using air freshener in the waiting room. Some patients react to fragrances, and the musty smell is still there underneath.
• Repainting the waiting room straight away. Damp walls make new paint blister, and mold grows back.
• Keeping the soaked waiting-room sofa. Foam cushions trap water and germs inside and should be replaced.

The Disinfection and Ozone Process for Dental Clinics

1. Survey together with the dentist. We check water height, mold hotspots, sealed rooms and the list of equipment that must be moved or covered, and coordinate timing with your equipment service technicians.
2. Prepare the space. Dental instruments, materials, medicines and patient records go into closed cabinets or sealed boxes. The X-ray unit, sensors, computers and other electronics are moved out or covered as the technician advises. Soaked cushions and materials are thrown away.
3. Disinfection fogging with Chemgene HLD4H. A ULV fogger reaches walls, corners, the underside of counters and the X-ray room floor. CHEMGENE HLD4H disinfectant has no harsh smell, which suits patients who are sensitive to odors, and is used according to its label instructions.
4. Ozone treatment in enclosed rooms. Especially the X-ray room and waiting room. A controlled dose of ozone matched to the room size helps destroy mold spores and break down musty odor.
5. Ventilation. Doors are opened and exhaust fans run until the ozone has fully broken down. A windowless X-ray room needs longer to ventilate than other rooms.
6. Re-check before patients return. We check for odor the next morning. Bringing medical equipment back into use follows the technician's inspection and the clinic's own standard procedures.

Safety: during ozone treatment there must be no people, pets or plants in the clinic. Rubber and silicone items, such as dental unit tubing and impression materials, should be stored in closed cabinets or removed. The ozone dose is controlled to suit the size of each room and the equipment inside it.

Room by Room: What Each Area of the Clinic Needs

• Waiting room and reception. Replace soaked seating, discard wet magazines and floor mats, fog walls and floors, and ozone-treat the empty room. Wait for walls to dry fully before repainting.
• Surgery. Instruments and materials go into closed storage. Dental units are covered as advised. Floors, walls and cabinet bases are fogged. Unit servicing is done by the technician.
• X-ray room. Equipment is moved or covered as the technician advises. The room is fogged and ozone-treated, then given extra ventilation time. Shielded walls and doors are not opened up.
• Sterilisation room. Walls, floors and the area under the sinks are fogged. The autoclave and washer are checked and tested by the technician under the clinic's existing system before use.
• Patient bathroom. Clean, fog and check drains for sewage odor from the flood.
• Compressor and suction area. Clear mud and debris, and have the technician inspect the equipment before it is switched on again.

A Preparation Checklist for the Day Before the Service

• Book your dental unit and X-ray service technicians to inspect before or after the service day, as appropriate.
• Store already-sterilised instruments in sealed pouches inside closed cabinets, never left out on trays.
• Store medicines, filling materials and impression materials in closed cabinets or boxes.
• Back up computers and patient X-ray images, then move or cover the machines as advised.
• Throw away soaked cushions, doormats, cardboard boxes and document folders.
• Clean air-conditioner filters and have a technician check any ground-floor units.
• Let patients with upcoming appointments know when the clinic will be closed.

Protecting the Clinic Team During the Clean-Up

In a small practice, the dentist and one or two assistants often do the clean-up themselves. Clinical habits help, but floodwater brings extra risks:

• Wear rubber gloves, boots and a well-fitting mask while removing mud and soaked furniture.
• Cover any cuts with waterproof dressings before starting.
• Bag moldy items before carrying them through the clinic.
• Wash hands thoroughly and change clothes before handling sterile items or records.
• Anyone who feels unwell after working in floodwater should see a doctor and mention the exposure.

Talking to Patients So They Feel Confident Coming Back

Patients around Photharam market know the clinic was flooded. Being open and straightforward builds more trust than saying nothing.

• Post on the clinic's page or LINE that the flooded areas have been cleaned, disinfected and ozone-treated, without making exaggerated claims.
• Make it clear that every instrument is still sterilised to the clinic's existing standards.
• For older patients or those with chronic conditions, consider morning appointments after the clinic has been aired out.
• Invite patients to ask questions. A short, honest answer at reception often reassures more than any notice on the wall.

A Simple Reopening Sequence

1. Clear and assess. Remove mud, discard soaked furniture and materials, and list equipment that needs a technician.
2. Dry. Ventilate and run dehumidifiers until floors and lower walls are drying properly.
3. Service equipment. Technicians inspect dental units, the X-ray machine, compressor and autoclave.
4. Disinfect and deodorise. Fog and ozone-treat the empty clinic, with extra ventilation time for the X-ray room.
5. Restock and reopen. Return sterilised instruments and materials, check odor first thing in the morning, and welcome patients back.

It can be tempting to reopen the moment the floor looks clean, especially for a single-dentist practice with no other income. In practice, a few extra days spent drying, servicing equipment and treating the rooms properly usually pays for itself. Patients who return to a clinic that smells fresh and feels cared for tend to stay loyal, and they tell their neighbours in the market. A clinic that reopens too early and still smells damp risks losing that trust, which is far harder to win back than a few days of income.

Air Conditioning, Waterlines and Other Hidden Sources

Even after walls and floors are clean, some parts of a clinic can quietly keep the musty smell or contamination alive. They are worth checking before reopening:

• Air conditioners. Indoor units on the ground floor may have taken in floodwater or humid air for days. Filters should be cleaned, and a technician should inspect and clean units that smell musty, because they can blow spores back into every room.
• Dental unit waterlines. Follow the manufacturer's guidance and your existing protocol for flushing and maintaining waterlines, especially if the unit's water supply was disturbed by the flood.
• Drains and floor traps. Drains that backed up during the flood can release a sewage smell. Clear and flush them, and check that traps hold water.
• Cabinet bases and kick boards. Chipboard cabinet bases soak up water and swell. If they smell or show mold, they usually need replacing.
• Behind the reception counter. Cables, paper and boxes stored on the floor behind the counter often stay damp and unnoticed.

Aftercare: Keeping the Clinic Fresh in the Weeks Ahead

• Morning smell check. Before patients arrive, walk through the X-ray room, surgery and waiting room and note any musty smell.
• Air the X-ray room between patients when possible. Leaving the door open for a few minutes during quiet periods helps keep humidity down.
• Run a dehumidifier overnight in the waiting room during the rainy season.
• Wipe high-touch surfaces such as door handles, the reception counter and waiting-room chairs with CHEMGENE HLD4H spray, alongside your usual clinical surface protocol.
• Photograph the old mold spots every week. If a new spot appears, send a photo to our team early.

10 Reasons Dental Clinics in Photharam Choose WHD

1. A clear scope: we look after the environment and never interfere with the clinic's instrument sterilisation standards.
2. Planning together with the dentist and equipment service technicians.
3. Fine-mist disinfection fogging reaches the corners of a sealed X-ray room.
4. Chemgene HLD4H has no harsh smell, suitable for older patients and children.
5. Ozone treatment breaks down musty odor in windowless rooms.
6. Controlled ozone dosing and care for delicate electronics.
7. Work scheduled outside clinic hours to minimise disruption to patients.
8. Advice on which cushions, sofas and soaked materials to discard.
9. Residential ozone treatment for upstairs living quarters in the same shophouse.
10. Easy to reach on LINE. Send photos and a floor plan for an initial assessment.

Before and After: Dr Nid's Clinic

In the Customer's Words

"We already have our own system for instruments. What worried me was the X-ray room with no window. The smell was really strong. The team planned with our equipment technician to move the machines first, then fogged and ozone-treated. Now my older denture patients say the clinic smells clean like it used to."

— Dr Nid, dental clinic near Photharam market (illustrative scenario)

Frequently Asked Questions

Q: After ozone treatment, can we skip autoclaving instruments?
A: No. Dental instruments must still be cleaned and sterilised to the clinic's existing standards every time. WHD services cover only the environment, such as walls, floors and air.

Q: Can a flooded dental X-ray machine be used straight away?
A: It should not be used until your equipment service provider has inspected it and the requirements of the relevant authorities have been met.

Q: The X-ray room has no window. How is it ventilated after ozone treatment?
A: We open the door and use exhaust fans, and wait until the ozone has fully broken down before anyone goes in. This can take longer than for an ordinary room.

Q: Water reached the base of the dental unit. What should we do?
A: Have the service technician check the unit's electrical, air and water systems first. Our team fogs the floor and walls around the unit, with the unit covered as advised.

Q: Can the work be done on the clinic's day off?
A: Yes, and we recommend it, so there is time to ventilate and re-check before patients arrive.

Q: Can the dentist's living quarters upstairs be treated at the same time?
A: Yes. We can treat them on the same day, with everyone out of the building during ozone treatment.

Q: Does the sterilisation room need anything extra?
A: We fog the walls, floor and the area under the sinks. The autoclave and instrument washer should be checked and tested by a technician under the clinic's existing system before they are used again.

Q: Will ozone affect dental materials stored in the clinic?
A: Some materials, particularly rubber, silicone and certain impression materials, can be sensitive to ozone. Keep them in closed cabinets or move them out before treatment, and check the manufacturer's storage guidance for anything you are unsure about.

Q: How soon after the flood should we book?
A: Once the mud is out and the clinic has started to dry, the sooner the better. Mold grows quickly in warm, damp rooms, and early treatment usually means less damage, fewer discarded items and a shorter closure.

Let Patients Sit Back in the Dental Chair With Peace of Mind

Serving dental clinics, medical clinics and shops in Photharam, Ban Pong, Mueang Ratchaburi, Damnoen Saduak and nearby areas.

View Disinfection Service – Click Here

Book Ozone Treatment – Click Here

Call 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related Pages and Sources

• CHEMGENE HLD4H spray disinfectant
• Ozone treatment for odors and chemical residue
• Residential ozone disinfection
• All articles
• External sources: WHO: Floods and health and Thailand Department of Disease Control

#DentalClinicDisinfection #PostFloodDisinfection #OzoneTreatment #MoldRemoval #MustyOdorRemoval #Disinfectant #ClinicFloodRecovery #DisinfectionService

Keywords: disinfecting a dental clinic after a flood, dental clinic after flood, dental X-ray room, clinic ozone treatment, mold removal, musty odor removal, Photharam, Ratchaburi 2026