Care after root canal — when to eat, why teeth crack and why you need a crown

Key facts

• Eat after numbness wears off; chew on the other side
• Avoid hard and sticky foods until the final restoration
• Back teeth can crack without a crown
• A broken unfinished tooth needs prompt assessment
• Teeth are sealed, not left open, between visits

When and what to eat after a root canal

Wait until the local anaesthesia has fully worn off, usually a few hours, before eating, so you do not bite your cheek, lip or tongue. For the first day or two, choose softer foods and chew on the opposite side. Until the permanent restoration is placed, avoid hard foods such as nuts, ice and hard bread, and sticky foods such as toffee or chewing gum that can pull out a temporary filling. Very hot or cold drinks may cause temporary discomfort. Some tenderness when biting is normal for a few days and usually responds to simple pain relief, if suitable for you, as advised by your dentist.

Why a tooth can break before the crown

Patients are often surprised when a molar cracks between the root canal and the crown. The main reason is that the tooth was already weakened by decay, old fillings and cracks, and the access opening needed to reach the canals removes more of its internal structure. Back teeth take strong chewing forces that can split weakened walls. Root-treated teeth also lack the nerve's protective sensation, so patients may bite harder without realising. This is why dentists usually recommend a crown or onlay for back teeth soon after root canal treatment. Until then, protect the tooth by chewing on the other side and avoiding hard foods.

If an unfinished root canal tooth broke

If part of the tooth breaks while treatment is still in progress or before the crown is fitted, contact the clinic promptly. Keep any broken piece if you can, avoid chewing on that side and rinse gently to keep the area clean. Whether the tooth can still be saved depends on where the fracture runs: breaks above the gum can often be restored with a build-up and crown, while a crack running deep below the gum or splitting the root may mean the tooth cannot be saved. X-rays and sometimes CBCT imaging help assess this. Acting quickly reduces the risk of contamination and further breakage.

Why the tooth should not be left open

In the past, teeth were sometimes left open after removing the nerve to let infection drain. This is generally no longer recommended, because an open tooth lets saliva, food and bacteria into the canals, which can make infection worse and treatment harder. Today, if drainage is needed, it is usually done during the appointment, and the tooth is then sealed with a medicated dressing and temporary filling. If your temporary filling falls out or the tooth feels open, contact the clinic so it can be resealed quickly. Delaying for weeks can allow reinfection and may lower the chance of success.

Restoring the tooth and follow-up at Manhal

The final restoration is a key part of root canal success, because a well-sealed crown or filling stops bacteria re-entering the canals. Front teeth with little damage may only need a filling, while back teeth usually need a crown or onlay, sometimes after a core build-up. At Manhal Medical Center in Dubai, Dr. Manhal Helfawee plans the restoration as part of the root canal treatment and explains the timing in a written plan. Seek urgent care if you develop facial swelling, fever, severe or increasing pain, a bad taste with discharge, or difficulty swallowing after treatment.

Root canal treatment removes infected or inflamed pulp from inside the tooth, cleans and shapes the canals, and seals them. It relieves toothache and allows you to keep your natural tooth instead of extracting it.

Prepared by the Manhal Medical Center editorial team · Updated: 2026-10-18 · Treating specialist: Dr. Manhal Helfawee

This page is general information and does not replace a consultation. Suitability, risks and results vary between patients.