Gage Endodontics photo 1
Gage Endodontics photo 2
2 photos

Gage Endodontics

Root Canal Treatment in Los Altos

Closed
(562) 420-1461WebsiteUpdated Aug 25, 2026

About Gage Endodontics

Gage Endodontics operates on East Spring Street in the Los Altos area of Long Beach, California. Root canal treatment removes infected or inflamed tissue from inside a tooth, cleans and seals the space, and allows the natural tooth to be kept rather than extracted. Its reputation for being painful is largely outdated — carried out under local anaesthetic, it typically relieves pain rather than causing it.

Day-to-day oral health still comes down to the basics between visits — brushing twice daily with fluoride toothpaste, cleaning between the teeth, and limiting how often sugary food and drink appear through the day matters more than the total amount eaten at once. Regular professional care is what catches whatever those habits do not.

Digital X-rays are a routine part of dental care because they show what a visual exam alone cannot — decay forming between teeth, bone loss below the gumline, and how developing adult teeth are positioned in children. They use a low radiation dose and are taken on a schedule matched to individual risk rather than at every single visit.

Left untreated, small dental problems tend not to stay small. A minor cavity that would have been a straightforward filling can progress to needing root canal treatment and a crown, and early gum inflammation that would have reversed with a good cleaning can progress toward bone loss around the teeth. Catching things early is generally the difference in both effort and cost.

Continuity matters in dental care — seeing the same practice over time means your history, X-rays, and any patterns in your oral health are already on file, rather than starting from scratch at each visit. That familiarity is part of what a regular dental home offers beyond any single appointment.

Dental anxiety is common, and most practices are used to working with nervous patients — through clear explanations of what is about to happen, a slower pace where needed, and sedation options for patients who want them. Avoiding the dentist out of anxiety tends to make eventual treatment more involved, not less. You can reach Gage Endodontics through this page to ask a question, check current availability, or request an appointment.

Based on East Spring Street in the Los Altos area of Long Beach, California, Gage Endodontics provides root canal treatment alongside routine dental care. The practice is open Monday through Friday. Contact details and a full list of services are on this page.

Clinic Details

Best Known For

Root Canal Treatment

Business Hours

Monday
9:00 AM5:00 PM
Tuesday
9:00 AM5:00 PM
Wednesday(Today)
9:00 AM5:00 PM
Thursday
9:00 AM5:00 PM
Friday
8:00 AM1:00 PM
SaturdayClosed
SundayClosed

Frequently Asked Questions

Where is Gage Endodontics located in Long Beach?
Gage Endodontics is on East Spring Street in the Los Altos area of Long Beach, California (90815).
What days is Gage Endodontics open?
Gage Endodontics is open Monday through Friday. Contact the practice through this page to confirm current appointment times before travelling.
What services does Gage Endodontics offer?
Listed services at Gage Endodontics include Root Canal Treatment. The full list is shown on this page.
How many appointments does root canal treatment take?
It can sometimes be completed in one visit, though more complex teeth with several canals may need two. Which applies depends on the tooth involved and whether there is active infection to settle first.
Do I need a crown after a root canal?
Often yes, particularly on back teeth. A treated tooth loses internal structure and becomes more brittle, so a crown is usually recommended to protect it against fracture under chewing forces.
What causes bad breath and can a dentist help?
Persistent bad breath most often comes from bacteria on the tongue and around the gumline, and gum disease is a frequent underlying cause. Because it is usually oral in origin, a dental examination is a sensible first step.

Location

Services Offered

Root Canal Treatment

Reviews

189 reviews

Smyleee Rating reflects verified profile signals, reviews, and overall care quality.

See all reviews

Recent Reviews

D
D***1 month ago

From the great vibe in the office, to the high-tech equipment, Gage Endodontics is where you want to go if you need a Endodontist. Dr Castellano treated me. I found her to be knowledgable, professional, empathetic and completely honest about my treatment options. I recommend this practice without hesitation.

B
B***2 months ago
l
l***2 months ago

I was pleased with my visit. I was lost and I called for directions. They were so nice and told me to take my time. I arrived on time and I was received with smiles The dental assistant and dentist were fabulous. They explained everything as they did the root canal. Later that evening I received a text to check in on how I was doing. I felt special and important. I love the time and energy the whole staff took to make me feel welcome. The endodontist was the best. Patient and understanding. I recommend Gage Endodontics to anyone needing a root canal. They are the best. Thank you all for your kindness and support.

A
A***2 months ago

Great experience. The office staff was amazing and the Process was seamless. Everything was explained thoroughly and the Dr took his time. I will definitely be returning for future work.

C
C***2 months ago
J
J***2 months ago

I don’t do well at the dentist’s office, and root canals are the worst. Dr. Castellanos did an excellent job talking me through the process. I actually dosed off during the procedure for a few seconds. Entire office staff was great.

L
L***2 months ago

Had a very excellent experience at Gage endontics . Was nervous about having root canal treatment . All the staff were pleasant and welcoming .Dr Castellanos was professional and explained everything , Unfortunately my tooth was unable to be saved. I still felt that Dr Castellanos gave her best effort to help me. I would highly recommend this office .

L
L***3 months ago

I had a great experience during my consultation. The doctor was professional, thorough, and took the time to clearly explain everything and answer my questions. The staff was also very kind and welcoming. I left feeling informed and much more at ease.

D
D***4 months ago

I had an excellent experience at Gage Endodontics, especially with Dr. Jennifer Castellanos, D.D.S. She is highly intelligent, knowledgeable, and brings a reassuring sense of warmth and lightness to her care. I was being treated for a periradicular radiolucency, and what could have been a painful and uncomfortable procedure turned out to be very manageable. Under Dr. Castellanos’s care, I felt at ease the entire time—the two-hour appointment went by surprisingly quickly. She performed a bicuspid restoration and precisely eliminated the infected area using advanced laser technology. Her skill and attention to detail were evident throughout the procedure. Her assistant Elizabeth was just as wonderful. I truly cannot recommend this dental office enough.

Reviews are aggregated from public sources.

Photos (2)

Gage Endodontics photo 1
Gage Endodontics photo 2