Get a free Case Review
Share your dental case with Dres. Castillo, biological dentists in Madrid since 1992 — whether you already have a treatment plan and want a second opinion, or you are only just starting. Every case is reviewed personally by the doctors, and you receive their assessment within 48–72 hours. It is free, and there is no obligation.
How it works
Three steps
Share your case
Share your dental history, concerns, and any available X‑rays or reports. This step is complimentary.
Expert review
Our specialists study your documentation and prepare a personalised assessment of your situation within 48–72 hours.
Your assessment and plan
You receive the doctors’ honest assessment in writing. If they can help, you also get a clear treatment plan and a fixed quote — with no obligation.
Why Bio Salud Dental
Pioneers in biological dentistry
Pioneers since 1992
Dr. Alejandro Castillo began practising biological dentistry in Madrid in 1992, when few others in Spain would. Today he treats patients alongside his son, Dr. Carlos Castillo — a father-and-son team with over three decades of specialised expertise.
100% metal-free
We exclusively use biocompatible materials — zirconia implants, ceramic restorations, and BPA-free composites. No metals, no mercury, no compromise.
Every case personally reviewed
No associates, no intermediaries. Dres. Castillo personally study your documentation and conduct every consultation. International patients travel to see us for this reason.
A real story
From Switzerland to Madrid
Wendelyn travelled from Switzerland for a full metal-free rehabilitation after a complex case of infected root canals and corroded titanium implants. Her journey started exactly here — with a free Case Review.
Frequently asked questions
What you should know
Biological dentistry considers the impact of dental materials and treatments on your overall health. At Bio Salud Dental, we use exclusively biocompatible materials — zirconia implants, ceramic restorations, and BPA-free composites — avoiding metals, mercury, and other potentially harmful substances.
Amalgam fillings contain approximately 50% mercury, a known neurotoxin. Over time, mercury vapour is released during chewing and grinding. We follow the SMART protocol (Safe Mercury Amalgam Removal Technique) to remove them safely, protecting both the patient and our team from mercury exposure.
Zirconia implants are metal-free dental implants made from zirconium dioxide, a highly biocompatible ceramic. Unlike titanium, zirconia does not corrode, does not trigger galvanic currents in the mouth, and carries no risk of metal allergy. They are also white, so they look more natural — especially where the gum is thin.
Submit your dental case through the form above — including your concerns, dental history, and any X-rays or reports. The doctors personally review your documentation within 48–72 hours and reply with their honest assessment. If they can help, you also receive a clear treatment plan and a fixed quote. There is no obligation, and if you would then like to talk it through with them, you can — only if you want to.
Yes. Patients travel from across Europe and beyond specifically to see Dres. Castillo. Dr. Alejandro Castillo has been practising biological dentistry since 1992, and his son Dr. Carlos Castillo continues the family legacy. We offer consultations in English and Spanish, and our team can help coordinate your visit to Madrid.
In biological dentistry, root canal-treated teeth are considered a potential source of chronic infection, as it is virtually impossible to completely sterilise the thousands of microscopic tubules inside a tooth. Dres. Castillo can evaluate your specific situation, review any existing root canals, and discuss the safest options for your long-term health.