A full-mouth dental series in a cat is 6 to 8 films, taken under general anesthesia, and it changes the treatment plan in a large share of mouths that looked acceptable on a visual exam. That is the whole case for the machine: 60 percent of a tooth sits below the gumline, and everything that matters, resorption, bone loss, fractured roots, is down there. The 2 image types available in practice are not interchangeable, and the 4-week recheck is what tells you whether the work held.
The 2 imaging types
Type 1 is intraoral dental radiography: a small film or sensor placed inside the mouth, 0.3 to 0.5 seconds of exposure, and 6 to 8 views covering the whole arcade at about 1 to 2 cm per view. Type 2 is standard or whole-body radiography, a tabletop film of the skull at 1 to 2 views, which shows the jaw outline, the temporomandibular joints and big lesions, but overlaps the left and right tooth rows into 1 blur.
Type 2 is a screening film. It can show a fractured mandible, a mass, or a 5 mm root fragment. It cannot show a 1 mm resorption lesion on a lower premolar, because the two sides superimpose. If a clinic offers only type 2 and calls it dental X-rays, the film will miss the most common feline dental disease.
What 6 to 8 films cover
The standard set is 2 upper canine views, 2 lower canine and incisor views, 2 maxillary premolar and molar views, and 2 mandibular premolar and molar views, for 6 to 8 total depending on mouth size and whether a third molar view is needed. A cat skull is small enough that 6 films often suffice; 8 gives margin at the caudal maxilla, where the root of the fourth premolar sits within 2 to 3 mm of the orbital floor.
Film count is a quality marker. A series of 3 or 4 films is a spot check, not a series, and it will systematically miss the caudal teeth, which is exactly where resorption and periodontal pockets cluster in cats over 8 years old.
What the films find that eyes do not
Tooth resorption affects 20 to 60 percent of cats over 5 years, and most lesions start at the root, below the gingiva, where nothing is visible until the crown is already gone. Periodontal bone loss of 30 to 50 percent shows as a widening of the periodontal ligament space and a rounded, blunted root; clinically the tooth still looks tight. Retained root fragments after a difficult extraction show as a 1 to 3 mm opacity in the alveolus, and they are the usual cause of a draining tract 2 to 6 weeks after surgery.
Two more findings matter for planning. A fractured canine with a 1 to 2 mm pulp exposure needs extraction or root canal within days, not weeks, because the pulp dies and the tooth becomes a chronic infection. Feline odontoclastic resorptive lesions that reach the pulp chamber cannot be saved by filling; the standard is extraction, and the film tells you whether the root is ankylosed, which changes the surgical approach.
Anesthesia is the gate, not the X-ray
The films themselves take 10 to 15 minutes; the anesthesia is 30 to 45 minutes and carries the real risk. A pre-anesthetic panel, packed cell volume, total protein, BUN, creatinine, ALT, glucose and a chest film in cats over 8 years, is what makes the series safe. Ask for an intravenous catheter, fluids at 3 to 5 ml/kg per hour, and active warming, because a cat under anesthesia loses 1 to 1.5 degrees C in the first 20 minutes.
If your cat has a heart murmur, the dental decision runs through cardiac imaging first; the comparison of echo and plain film for heart disease is laid out in echo versus X-ray for the heart. Dental films do not replace that workup.
The 4-week recheck
Four weeks after extractions or a scaling, the mouth is re-examined: 4 specific things. Gingival healing at each extraction site, closure of the socket, return of normal eating on both sides, and the absence of a draining tract or swelling. Most soft tissue closes in 10 to 14 days, but bone fills over 8 to 12 weeks, which is why 4 weeks is the first checkpoint and 3 months is the second.
Bring the films to that visit. Comparing the 4-week exam against the pre-op series is how a missed fragment or a failing site gets caught while it is still a 2 minute fix rather than a second anesthetic.
Cost, and what to ask for
Expect the series to add USD 80 to 200 to a dental procedure, on top of 250 to 600 for the cleaning and 15 to 60 per extraction. That is 1 to 2 percent of a 10-year cost of care, for the test that decides how many teeth come out. Ask 3 questions before booking: how many films are in your series, will I get the images, and who reads them.
| Film view | Films per series | Exposure (seconds) | Main target |
|---|---|---|---|
| Maxillary canines | 2 | 0.3-0.4 | Root resorption, apical abscess |
| Mandibular canines and incisors | 2 | 0.3-0.4 | Fracture, bone loss at 30-50% |
| Maxillary premolars and molars | 2 | 0.4-0.5 | Fourth premolar roots, orbital floor |
| Mandibular premolars and molars | 2 | 0.4-0.5 | Retained roots, 1-3 mm fragments |
| Skull survey (type 2) | 1-2 | 0.1-0.2 | Jaw fracture, mass, screening only |
Four things to do this month
- Ask whether the practice takes 6 to 8 intraoral films; if the answer is 2 or 3, book elsewhere.
- Get the pre-anesthetic panel done 7 to 14 days ahead so results are in hand.
- Request a copy of the images and the radiology note for your own file.
- Put the 4-week recheck and the 3-month check in the calendar before the procedure, and read the dental home plan for the 2 minutes of brushing that keeps the work from being undone.
Terms mentioned in this article
Frequently asked
Are dental X-rays safe for an old cat?
The radiation from 6 to 8 intraoral films is small, roughly 0.3 to 0.5 seconds of exposure per view and well under 1 mSv for the series. The real risk is the 30 to 45 minutes of anesthesia, which is why a pre-anesthetic panel and a chest film in cats over 8 years come first. Untreated dental infection is the larger risk in most older cats.
Why 6 to 8 films instead of 2 or 3?
Each film covers 1 to 2 cm of arcade and the left and right rows overlap on any view that is not taken from inside the mouth. Six films cover both canines, both premolar and molar regions and the incisors; 8 adds margin at the caudal maxilla, where the fourth premolar root sits 2 to 3 mm from the orbital floor.
What happens at the 4-week recheck?
Four things are checked: gingival healing at each extraction site, socket closure, normal eating on both sides, and no draining tract or swelling. Soft tissue closes in 10 to 14 days but bone takes 8 to 12 weeks, so 4 weeks is the first checkpoint and 3 months is the second. Bring the pre-op films.