Scientists in two countries announced these medical breakthroughs this month as regenerative medicine continues to gain traction.

Medical science may be about to achieve two things once thought impossible.

One is re-growing teeth, something that would eliminate the need for dental fillings.

The other is healing surgical wounds without leaving scars, a process that involves using a drug designed to treat Alzheimer’s disease.

Teams of scientists in England and the United States, following years of research with mice, announced these discoveries this month.

They hope to begin clinical trials soon.