Do Non-surgical Nose Job Fillers Dissolve Completely?

Fillers such as Radiesse eventually dissolve, but this can take a long time in certain areas of the face such as the nose. By "a long time" I mean 2 years or occasionally longer.
Hyaluronic acid gels, on the other hand (Juvederm, Restylane, Perlane, etc.), not only dissolve and resorb more quickly, but if need be their dissolution can be sped up with the injection of hyaluronidase, an enzyme that breaks down hyaluronic acid. This property makes HA fillers very forgiving.
Non-resorbable fillers, such as Artefill--as the term implies--do not resorb or go away. This is both good and bad, depending on what it's used for in the nose and how it's applied.
Certainly if someone is considering a revision surgical rhinoplasty and has a temporary filler (Radiesse, Juvederm, etc.), it's very important that the filler is completely dissolved before surgery so that an accurate revision can be done.
All the best,
--DCP

However the length of time varies with the product. Juvederm and Restylane last 4 to 6 months. A bit longer than elsewhere in the face as there is less movement at the nose. Radiesse lasts longer, a year or two. There are few surgeons using permanent fillers at present. Injectable rhinoplasty is great for minor irregularities and small augmentations. Unfortunately it can't make a nose smaller, so its not suitable for many noses. However it those cases where it is indicated, it works very well.

Yes they can dissolve completely but it depends on the product that is being used. Some fillers will last less than a year while others will last up to 5 years. Permanent fillers have also been used but are largely unpopular.

Most fillers that are deemed resorbable will eventually disappear after 6-12 months with some lasting a bit longer. 

While fillers do dissolve over time, the time it takes to dissolve does vary. There are also some studies to suggest that some fillers create inflammation that can persist even after the filler is gone.

A cross linked hyaluronic acid filler such as Juvederm does dissolve.  The result typically lasts 6 months. The filler is broken down by the body are removed.  However, some inflammatory tissue and scar at the site of injection may remain.

This is a great question that we get in our practice a fair bit and that we have looked into. In fact, we in association with our colleagues reviewed the largest series of injectible rhinoplasties done by anyone to date.I don’t want to make this a long diatribe about the merits of injectible rhinoplasty and if the aesthetics make a lot of sense, except to say that you should recognize that most people getting rhinoplasty want their nose at least slightly smaller whereas injectible nose jobs are by definition an augmenting procedure where the nose is made larger.
In general, we found that about 25% of people required a touch up before 6 months when radiesse was used, either due to partial resorption or because they wanted further augmentation. Moreover, other more longer lasting injectibles such as radiesse, sculptra, artefill, etc can and do stay longer in the nose but can cause inflammation, infection, or other problems. In fact, if you go to our blog a few weeks back we show an example of a patient in whom we did surgery who had had injectible nose job done some 7-8 months previously. (previous blog) In him, you can still see the injectible material that had to be removed. He is now very happy with his nose and he did great but it made surgery more difficult than it otherwise needed to be.
The point to all of this is that non surgical nose jobs, in our opinion, can be great to fill in minor defects or irregularities, but they do not necessarily replace or help achieve the goals that most people who want a smaller nose want.
I genuinely hope this helps answer your questions. Feel free to contact us if you have any more specific questions.